diff --git a/VERSION.properties b/VERSION.properties
index 5df04bf..b63d46a 100644
--- a/VERSION.properties
+++ b/VERSION.properties
@@ -1,2 +1,2 @@
-client.version=1.2.7
-server.version=1.2.7
+client.version=1.2.8
+server.version=1.2.8
diff --git a/shine-UI/index.html b/shine-UI/index.html
index f4b7656..8309c71 100644
--- a/shine-UI/index.html
+++ b/shine-UI/index.html
@@ -6,8 +6,8 @@
     <link rel="manifest" href="./manifest.webmanifest" />
     <title>Shine UI Demo</title>
     <script>
-      window.__SHINE_BUILD_HASH__ = '20260426105500';
-      window.__SHINE_CLIENT_VERSION__ = '1.2.7';
+      window.__SHINE_BUILD_HASH__ = '20260426113000';
+      window.__SHINE_CLIENT_VERSION__ = '1.2.8';
     </script>
     <script>
       (function attachStylesWithBuildHash() {
diff --git a/shine-UI/js/pages/settings-view.js b/shine-UI/js/pages/settings-view.js
index 36e0c55..cfd8690 100644
--- a/shine-UI/js/pages/settings-view.js
+++ b/shine-UI/js/pages/settings-view.js
@@ -7,6 +7,12 @@ import {
   promptPwaInstall,
 } from '../services/pwa-install-service.js';
 import { initPwaPush } from '../services/pwa-push-service.js';
+import { getArweaveWalletFromStoredDeviceKey } from '../services/arweave-wallet-service.js';
+import {
+  prepareAvatarImageFile,
+  uploadArweaveFile,
+  validateAvatarSourceFile,
+} from '../services/arweave-file-service.js';
 
 export const pageMeta = { id: 'settings-view', title: 'Настройки' };
 
@@ -32,6 +38,168 @@ function formatVersionForUi(rawValue) {
   return value;
 }
 
+function clearArweaveJwk(walletCtx) {
+  if (!walletCtx?.jwk || typeof walletCtx.jwk !== 'object') return;
+  Object.keys(walletCtx.jwk).forEach((key) => {
+    walletCtx.jwk[key] = '';
+  });
+  walletCtx.jwk = null;
+}
+
+function formatBytes(bytes) {
+  const value = Number(bytes || 0);
+  if (!Number.isFinite(value) || value <= 0) return '0 B';
+  if (value < 1024) return `${value} B`;
+  if (value < 1024 * 1024) return `${(value / 1024).toFixed(1)} KB`;
+  return `${(value / (1024 * 1024)).toFixed(2)} MB`;
+}
+
+function openDeveloperAvatarUploadModal({ walletLogin, storagePwd, gateway } = {}) {
+  const root = document.getElementById('modal-root');
+  if (!root) return;
+
+  root.innerHTML = `
+    <div class="modal" id="settings-dev-avatar-modal">
+      <div class="modal-card stack settings-dev-avatar-modal-card">
+        <h3 class="modal-title">Загрузить аватар (Arweave)</h3>
+        <label class="field-label" for="settings-dev-avatar-login">Логин пользователя</label>
+        <input class="input" id="settings-dev-avatar-login" type="text" maxlength="60" placeholder="Например: aidar" value="" />
+        <label class="field-label" for="settings-dev-avatar-file">Файл изображения</label>
+        <input class="input" id="settings-dev-avatar-file" type="file" accept="image/jpeg,image/png,image/webp" />
+        <p class="meta-muted">Поддерживаются JPEG, PNG, WebP. Перед загрузкой изображение будет оптимизировано.</p>
+        <div class="settings-dev-avatar-meta" id="settings-dev-avatar-meta"></div>
+        <p class="inline-error settings-dev-avatar-error" id="settings-dev-avatar-error"></p>
+        <div class="form-actions-grid">
+          <button class="secondary-btn" id="settings-dev-avatar-cancel" type="button">Закрыть</button>
+          <button class="primary-btn" id="settings-dev-avatar-upload" type="button">Загрузить</button>
+        </div>
+        <div class="card stack settings-dev-avatar-result" id="settings-dev-avatar-result" hidden>
+          <p class="meta-muted">Transaction ID:</p>
+          <p class="key-value" id="settings-dev-avatar-txid"></p>
+          <button class="ghost-btn" id="settings-dev-avatar-copy" type="button">Скопировать TX ID</button>
+        </div>
+      </div>
+    </div>
+  `;
+
+  const modal = root.querySelector('#settings-dev-avatar-modal');
+  const loginInput = root.querySelector('#settings-dev-avatar-login');
+  const fileInput = root.querySelector('#settings-dev-avatar-file');
+  const metaEl = root.querySelector('#settings-dev-avatar-meta');
+  const errorEl = root.querySelector('#settings-dev-avatar-error');
+  const cancelBtn = root.querySelector('#settings-dev-avatar-cancel');
+  const uploadBtn = root.querySelector('#settings-dev-avatar-upload');
+  const resultCard = root.querySelector('#settings-dev-avatar-result');
+  const txidEl = root.querySelector('#settings-dev-avatar-txid');
+  const copyBtn = root.querySelector('#settings-dev-avatar-copy');
+
+  if (loginInput instanceof HTMLInputElement) {
+    loginInput.value = String(walletLogin || '').trim();
+  }
+
+  let isClosed = false;
+  const closeModal = () => {
+    if (isClosed) return;
+    isClosed = true;
+    root.innerHTML = '';
+  };
+
+  const setError = (text) => {
+    if (errorEl) errorEl.textContent = String(text || '');
+  };
+  const setMeta = (text) => {
+    if (metaEl) metaEl.textContent = String(text || '');
+  };
+  const setTxId = (txId) => {
+    if (!(resultCard instanceof HTMLElement) || !(txidEl instanceof HTMLElement)) return;
+    const value = String(txId || '').trim();
+    txidEl.textContent = value;
+    resultCard.hidden = !value;
+  };
+
+  modal?.addEventListener('click', (event) => {
+    if (event.target === modal) closeModal();
+  });
+  cancelBtn?.addEventListener('click', closeModal);
+  copyBtn?.addEventListener('click', async () => {
+    const txId = String(txidEl?.textContent || '').trim();
+    if (!txId) return;
+    try {
+      await navigator.clipboard.writeText(txId);
+      setError('');
+    } catch {
+      setError('Не удалось скопировать TX ID.');
+    }
+  });
+
+  uploadBtn?.addEventListener('click', async () => {
+    setError('');
+    setTxId('');
+    const targetLogin = String(loginInput?.value || '').trim();
+    const file = fileInput?.files?.[0] || null;
+    if (!targetLogin) {
+      setError('Введите логин пользователя.');
+      return;
+    }
+    if (!file) {
+      setError('Выберите файл изображения.');
+      return;
+    }
+    if (!String(walletLogin || '').trim() || !String(storagePwd || '').trim()) {
+      setError('Нет активной сессии. Войдите заново и повторите.');
+      return;
+    }
+
+    uploadBtn.disabled = true;
+    let walletCtx = null;
+    try {
+      validateAvatarSourceFile(file);
+      setMeta('Подготовка изображения...');
+      const optimized = await prepareAvatarImageFile(file);
+      setMeta(
+        `Файл подготовлен: ${formatBytes(optimized.originalSizeBytes)} → ${formatBytes(optimized.optimizedSizeBytes)} ` +
+        `(${optimized.width}x${optimized.height}, ${optimized.contentType})`,
+      );
+
+      walletCtx = await getArweaveWalletFromStoredDeviceKey({
+        login: walletLogin,
+        storagePwd,
+        onStatus: (message) => setMeta(message),
+      });
+      setMeta('Загрузка в Arweave...');
+
+      const uploaded = await uploadArweaveFile({
+        gateway,
+        jwk: walletCtx?.jwk,
+        file: optimized.file,
+        tags: [
+          { name: 'SHiNE-Profile-Login', value: targetLogin },
+        ],
+      });
+      const txId = String(uploaded?.id || '').trim();
+      if (!txId) throw new Error('Пустой Transaction ID');
+
+      setMeta('Загрузка завершена.');
+      setTxId(txId);
+    } catch (error) {
+      const message = String(error?.message || '');
+      if (
+        message === 'Выберите файл изображения.'
+        || message === 'Поддерживаются только JPEG, PNG или WebP.'
+        || message === 'Файл слишком большой. Максимум 10 MB.'
+        || message === 'Не удалось подготовить изображение.'
+      ) {
+        setError(message);
+      } else {
+        setError('Не удалось загрузить аватар в Arweave.');
+      }
+    } finally {
+      clearArweaveJwk(walletCtx);
+      uploadBtn.disabled = false;
+    }
+  });
+}
+
 export function render({ navigate }) {
   const screen = document.createElement('section');
   screen.className = 'stack';
@@ -50,20 +218,50 @@ export function render({ navigate }) {
     <button class="text-btn" type="button" id="settings-device">Устройства</button>
     <button class="text-btn" type="button" id="settings-servers">Настройки серверов</button>
     <button class="text-btn" type="button" id="settings-language">Язык / Language</button>
-    <button class="text-btn" type="button" id="settings-app-log">Лог приложения</button>
-    <button class="text-btn" type="button" id="settings-pwa-diagnostics">Диагностика PWA / Push</button>
     <button class="text-btn" type="button" id="settings-signout">Завершить текущий сеанс</button>
-    <button class="text-btn" type="button" id="settings-pwa-install">Зарегистрировать PWA</button>
   `;
 
   card.querySelector('#settings-device').addEventListener('click', () => navigate('device-view'));
   card.querySelector('#settings-servers').addEventListener('click', () => navigate('server-settings-view'));
   card.querySelector('#settings-language').addEventListener('click', () => navigate('language-view'));
-  card.querySelector('#settings-app-log').addEventListener('click', () => navigate('app-log-view'));
-  card.querySelector('#settings-pwa-diagnostics').addEventListener('click', () => navigate('pwa-diagnostics-view'));
 
   const signOutBtn = card.querySelector('#settings-signout');
-  const pwaInstallBtn = card.querySelector('#settings-pwa-install');
+  const developerCard = document.createElement('div');
+  developerCard.className = 'card stack settings-developer-card';
+  developerCard.innerHTML = `
+    <button class="text-btn" type="button" id="settings-dev-toggle">Для разработчиков</button>
+    <div class="stack settings-developer-panel" id="settings-dev-panel" hidden>
+      <button class="text-btn" type="button" id="settings-app-log">Лог приложения</button>
+      <button class="text-btn" type="button" id="settings-pwa-diagnostics">Диагностика PWA / Push</button>
+      <button class="text-btn" type="button" id="settings-pwa-install">Как установить PWA</button>
+      <button class="text-btn" type="button" id="settings-upload-avatar">Загрузить аватар</button>
+    </div>
+  `;
+
+  const developerToggleBtn = developerCard.querySelector('#settings-dev-toggle');
+  const developerPanel = developerCard.querySelector('#settings-dev-panel');
+  const appLogBtn = developerCard.querySelector('#settings-app-log');
+  const diagnosticsBtn = developerCard.querySelector('#settings-pwa-diagnostics');
+  const pwaInstallBtn = developerCard.querySelector('#settings-pwa-install');
+  const uploadAvatarBtn = developerCard.querySelector('#settings-upload-avatar');
+
+  developerToggleBtn?.addEventListener('click', () => {
+    const isHidden = developerPanel?.hidden !== false;
+    if (developerPanel) developerPanel.hidden = !isHidden;
+    if (developerToggleBtn) {
+      developerToggleBtn.textContent = isHidden ? 'Для разработчиков ▲' : 'Для разработчиков ▼';
+    }
+  });
+
+  appLogBtn?.addEventListener('click', () => navigate('app-log-view'));
+  diagnosticsBtn?.addEventListener('click', () => navigate('pwa-diagnostics-view'));
+  uploadAvatarBtn?.addEventListener('click', () => {
+    openDeveloperAvatarUploadModal({
+      walletLogin: state.session.login,
+      storagePwd: state.session.storagePwdInMemory,
+      gateway: state.entrySettings.arweaveServer,
+    });
+  });
 
   const syncPwaButtonLabel = () => {
     if (isStandalonePwaMode()) {
@@ -191,5 +389,6 @@ export function render({ navigate }) {
     unsubscribeInstallAvailability();
   };
   screen.append(versionCard);
+  screen.append(developerCard);
   return screen;
 }
diff --git a/shine-UI/styles/components.css b/shine-UI/styles/components.css
index 84922f2..2fcddcc 100644
--- a/shine-UI/styles/components.css
+++ b/shine-UI/styles/components.css
@@ -1092,6 +1092,35 @@
   border: 1px solid rgba(134, 157, 205, 0.2);
 }
 
+.settings-developer-card {
+  margin-top: 4px;
+}
+
+.settings-developer-panel {
+  margin-top: 2px;
+  padding-top: 8px;
+  border-top: 1px solid rgba(132, 157, 206, 0.22);
+}
+
+.settings-dev-avatar-modal-card {
+  max-width: 520px;
+}
+
+.settings-dev-avatar-meta {
+  min-height: 18px;
+  font-size: 13px;
+  color: #d9e7ff;
+}
+
+.settings-dev-avatar-error {
+  min-height: 18px;
+  color: #f0a9b3;
+}
+
+.settings-dev-avatar-result {
+  gap: 8px;
+}
+
 .contact-search-actions {
   display: grid;
   grid-template-columns: 1fr;