diff --git a/CHANGELOG.md b/CHANGELOG.md
index c963f34..e7588eb 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,14 @@ every change carries a descriptive commit message.
 
 ## [Unreleased]
 
+## [3.40.2] — 2026-10-26
+
+### Added
+
+- **File filter: reset (✕) button.**  A red ✕ to the right of the filter
+  selector appears whenever the filter is not "All" and resets it to "All"
+  in one click.
+
 ## [3.40.1] — 2026-10-26
 
 ### Changed
diff --git a/frontend/index.html b/frontend/index.html
index e6df90a..fbe9b03 100644
--- a/frontend/index.html
+++ b/frontend/index.html
@@ -1127,6 +1127,7 @@
 								<button type="button" id="pysim-fs-filter-btn" aria-haspopup="true" aria-expanded="false" onclick="pysimFsFilterToggle()" class="px-2 py-0.5 text-xs rounded border border-gray-300 dark:border-slate-600 hover:bg-gray-200 dark:hover:bg-slate-700 text-gray-700 dark:text-slate-300 max-w-xs truncate">All</button>
 								<div id="pysim-fs-filter-menu" role="group" aria-label="Filter" class="hidden absolute left-0 mt-1 z-50 w-64 max-h-64 overflow-y-auto rounded border border-gray-300 dark:border-slate-600 bg-white dark:bg-slate-800 p-2 shadow-lg"></div>
 							</div>
+							<button type="button" id="pysim-fs-filter-clear" onclick="pysimFsFilterClear()" class="hidden px-1 text-xs text-red-600 dark:text-red-400 hover:text-red-700 dark:hover:text-red-300" data-l10n-title="Reset filter" aria-label="Reset filter">✕</button>
 						</div>
 						<button id="pysim-fs-probe-btn" data-needs="card" onclick="pysimFsProbeAll()" class="w-full mb-1 px-2 py-0.5 rounded bg-gray-600 text-white hover:bg-gray-700 disabled:opacity-40 disabled:cursor-not-allowed" data-l10n="Probe all files">Probe all files</button>
 						<div id="pysim-fs-probe-status" class="hidden mb-1 text-gray-500 dark:text-slate-400"></div>
@@ -1989,7 +1990,7 @@
 // ===== Version =====
 // Single source of truth for the PWA version: shown in the header and used
 // by the server version check in pysimConnect().
-const SIMPLE_VERSION = '3.40.1';
+const SIMPLE_VERSION = '3.40.2';
 document.getElementById('app-version').textContent = 'v' + SIMPLE_VERSION;
 
 // ===== view history (the browser Back/Forward buttons) =====
@@ -16270,6 +16271,7 @@ function pysimFsFilterRender() {
 	const menu = document.getElementById('pysim-fs-filter-menu');
 	const btn = document.getElementById('pysim-fs-filter-btn');
 	if (!menu) return;
+	const active = pysimFsFilter.size > 0 && !pysimFsFilter.has(FS_FILTER_ALL);
 	const services = fsFilterServiceOptions();
 	const item = (id, label) =>
 		'<label class="flex items-center gap-2 px-2 py-0.5 rounded cursor-pointer hover:bg-gray-100 dark:hover:bg-slate-700 text-xs text-gray-700 dark:text-slate-200">' +
@@ -16296,7 +16298,6 @@ function pysimFsFilterRender() {
 	if (btn) {
 		btn.textContent = pysimFsFilterSummary();
 		// a non-"All" selection stands out (blue, like the active sort pill)
-		const active = pysimFsFilter.size > 0 && !pysimFsFilter.has(FS_FILTER_ALL);
 		btn.classList.toggle('bg-blue-600', active);
 		btn.classList.toggle('text-white', active);
 		btn.classList.toggle('text-gray-700', !active);
@@ -16304,6 +16305,11 @@ function pysimFsFilterRender() {
 		btn.classList.toggle('hover:bg-gray-200', !active);
 		btn.classList.toggle('dark:hover:bg-slate-700', !active);
 	}
+	const clearBtn = document.getElementById('pysim-fs-filter-clear');
+	if (clearBtn) {
+		clearBtn.classList.toggle('hidden', !active);
+		clearBtn.setAttribute('aria-label', t('Reset filter'));
+	}
 }
 
 // Expand or collapse the menu (`force` overrides the toggle; the outside
@@ -16339,6 +16345,11 @@ function pysimFsFilterSetEntry(entry, on) {
 	pysimFsAutoExpandForFilter();
 }
 
+// The ✕ next to the filter selector: back to "All".
+function pysimFsFilterClear() {
+	pysimFsFilterSetEntry(FS_FILTER_ALL, true);
+}
+
 // The cross-reference inverted to service number -> feature name, per file
 // table.  Both maps are declared later in this file, so they are read on the
 // first call, never while the filter block itself is evaluated.
@@ -28100,6 +28111,7 @@ const LANG_RU = {
 	'Sort:': 'Сортировка:',
 	'Name': 'Имя',
 	'Filter:': 'Фильтр:',
+	'Reset filter': 'Сбросить фильтр',
 	'(no filters yet)': '(фильтров пока нет)',
 	'Identifiers': 'Идентификаторы',
 	'PLMN selection': 'Выбор PLMN',
diff --git a/frontend/sw.js b/frontend/sw.js
index 9725a87..ec983b0 100644
--- a/frontend/sw.js
+++ b/frontend/sw.js
@@ -1,4 +1,4 @@
-const CACHE = 'simple-v486';
+const CACHE = 'simple-v487';
 const URLS = [
   'index.html',
   'help.html',
diff --git a/frontend/tests/fs_filter.test.js b/frontend/tests/fs_filter.test.js
index b71123b..b1e29d4 100644
--- a/frontend/tests/fs_filter.test.js
+++ b/frontend/tests/fs_filter.test.js
@@ -111,10 +111,11 @@ function fakeMenu() {
 	};
 }
 
-const dom = { menu: null, btn: null };
+const dom = { menu: null, btn: null, clear: null };
 globalThis.document = {
 	getElementById: id => (id === 'pysim-fs-filter-menu' ? dom.menu
-		: (id === 'pysim-fs-filter-btn' ? dom.btn : null)),
+		: (id === 'pysim-fs-filter-btn' ? dom.btn
+			: (id === 'pysim-fs-filter-clear' ? dom.clear : null))),
 };
 
 let code = '';
@@ -123,7 +124,7 @@ for (const f of ['fsFilterServiceOptions', 'fsFilterIndexBuild', 'fsFilterIndex'
 	'fsFilterPathsKeyOf', 'pysimFsFilterPathsInvalidate', 'pysimFsFilterMatchingPaths',
 	'pysimFsFilterMatch', 'pysimFsFilterShow', 'pysimFsFilterLabel',
 	'pysimFsFilterSummary', 'pysimFsFilterRender', 'pysimFsFilterToggle',
-	'pysimFsFilterSetEntry', 'pysimFsFilterRestore', 'pysimFsNodePath',
+	'pysimFsFilterSetEntry', 'pysimFsFilterClear', 'pysimFsFilterRestore', 'pysimFsNodePath',
 	'pysimFsExpandAll', 'pysimFsCollapseAll', 'pysimFsAutoExpandForFilter']) {
 	code += extractFunc(html, f) + '\n';
 }
@@ -161,6 +162,31 @@ test('the file tree has a collapsed filter dropdown next to the sort pills', ()
 	assert.ok(!/pysimFsSetFilter\(/.test(html));
 });
 
+test('the ✕ next to the selector resets a non-All filter to All', () => {
+	// markup: a hidden red ✕ that clears the filter
+	assert.match(html, /id="pysim-fs-filter-clear"[^>]*onclick="pysimFsFilterClear\(\)"/);
+	assert.match(html, /id="pysim-fs-filter-clear"[^>]*data-l10n-title="Reset filter"/);
+	// the clear handler resets to All
+	const fn = extractFunc(html, 'pysimFsFilterClear');
+	assert.ok(fn.indexOf('pysimFsFilterSetEntry(FS_FILTER_ALL, true)') > 0, fn);
+	// the render shows it only when a non-All filter is active
+	dom.menu = fakeMenu();
+	dom.btn = fakeBtn();
+	dom.clear = fakeBtn();
+	withFilter(['plmn-selection'], () => {
+		pysimFsFilterRender();
+		assert.strictEqual(dom.clear.classes.has('hidden'), false);
+		assert.strictEqual(dom.clear.attrs['aria-label'], 'Reset filter');
+	});
+	withFilter(['all'], () => {
+		pysimFsFilterRender();
+		assert.strictEqual(dom.clear.classes.has('hidden'), true);
+	});
+	// the Russian entry exists
+	const dict = html.match(/const LANG_RU = \{([\s\S]*?)\n\};/)[1];
+	assert.ok(dict.includes("'Reset filter':"), 'missing Russian entry');
+});
+
 test('an outside click or Escape closes the menu', () => {
 	const click = html.match(/document\.addEventListener\('click', e => \{([\s\S]{0,600}?)\n\}\);/);
 	assert.ok(click, 'no document click listener');
diff --git a/pyproject.toml b/pyproject.toml
index fb78e70..7429f40 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "pysim-simple-server"
-version = "3.40.1"
+version = "3.40.2"
 description = "HTTP REST server wrapping pysim for the SIMple PWA"
 license = { text = "GPL-2.0-or-later" }
 requires-python = ">=3.9"
diff --git a/pysim_simple_server/server.py b/pysim_simple_server/server.py
index c4777f1..e7edd71 100644
--- a/pysim_simple_server/server.py
+++ b/pysim_simple_server/server.py
@@ -37,7 +37,7 @@ from osmocom.tlv import BER_TLV_IE
 from osmocom.utils import rpad
 
 
-VERSION = '3.40.1'
+VERSION = '3.40.2'
 
 MAX_ENVELOPE_SEGMENTS = 5  # max SMS segments for outgoing C-APDU in ENVELOPE