diff --git a/frontend/index.html b/frontend/index.html
index 893bb75..1dfda98 100644
--- a/frontend/index.html
+++ b/frontend/index.html
@@ -1665,7 +1665,7 @@
 // ===== 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 = '3.6.6';
+const SIMPLE_VERSION = '3.6.7';
 document.getElementById('app-version').textContent = 'v' + SIMPLE_VERSION;
 
 // ===== Tab switching =====
@@ -8817,7 +8817,9 @@ async function ramExplore(sp) {
 	await paginate('10', modules, (hex) => ramParseElfStatus(hex, true), t('ELF Modules'));
 
 	ramMergeElfData(elfs, modules);
-	ramSaveCntr(cntr);
+	// Only write the counter when a packet was actually accepted: a run whose
+	// start value was stale must never lower the preset counter.
+	if (cntr !== sp.cntr) ramSaveCntr(cntr);
 	ramHideProgress();
 
 	if (errors.length) {
@@ -8848,6 +8850,10 @@ function ramDeleteApdu(aid, withCascade) {
 }
 
 async function ramDeleteFromExplorer(aid, withCascade) {
+	// The preset is the source of truth (see ramExecute): re-read it before
+	// the operation so a stale form copy cannot send an already-consumed
+	// counter.
+	spRefreshFromPreset('ram-card-sel');
 	const sp = getRamSpParams();
 	if (!sp.kicKey || !sp.kidKey) {
 		alert(t('Select a card preset with keys first (RAM subtab → Card preset)'));
@@ -8860,19 +8866,31 @@ async function ramDeleteFromExplorer(aid, withCascade) {
 	ramShowProgress(label + ' ' + aid + '...');
 	const res = await ramSendOta(apdu, sp);
 	ramHideProgress();
+	// The card consumes the counter as soon as it accepts the packet, even
+	// when the remote command fails; a rejected packet (cntr_low, PoR error)
+	// leaves it untouched.
+	if (res.success && spPorAccepted(res.por)) {
+		sp.cntr = ramIncrementCntr(sp.cntr);
+		ramSaveCntr(sp.cntr);
+	}
 	const resultEl = document.getElementById('ram-result');
 	const stepsEl = document.getElementById('ram-steps');
-	if (!res.success || !res.por || res.por.response_status !== 'por_ok') {
-		resultEl.textContent = t('Failed') + ': ' + (res.por ? res.por.response_status : res.error || res.sw);
+	const sw = res.por && res.por.decoded ? res.por.decoded.last_status_word : '';
+	if (!res.success || !res.por || res.por.response_status !== 'por_ok' ||
+	    (sw && !ramRemoteSwOk(sw))) {
+		resultEl.textContent = t('Failed') + ': ' +
+			(res.por ? res.por.response_status : (res.error || res.sw)) +
+			(sw ? ' · ' + t('remote SW') + ' ' + sw : '');
 		resultEl.classList.remove('hidden', 'text-green-600'); resultEl.classList.add('text-red-600');
 		return;
 	}
-	ramSaveCntr(ramIncrementCntr(sp.cntr));
-	const sw = res.por.decoded ? res.por.decoded.last_status_word : '';
 	stepsEl.classList.remove('hidden');
 	stepsEl.textContent = label + ' ' + aid + ' -> ' + sw;
 	resultEl.textContent = t('OK');
 	resultEl.classList.remove('hidden', 'text-red-600'); resultEl.classList.add('text-green-600');
+	// Continue from the counter the delete consumed: replaying the old one
+	// gets cntr_low on every page and the failed run writes it back over the
+	// preset (the counter reset reported after Delete All).
 	await ramExplore(sp);
 }
 
@@ -9475,6 +9493,15 @@ function spPorAccepted(por) {
 		por.response_status === 'actual_response_sms_submit';
 }
 
+// Remote-command status words that count as success (mirrors the server's
+// `_ram_remote_sw_ok`): 9000 normal; 61xx more data available; 62xx/63xx
+// warnings; CAFE GlobalPlatform "more data available" (GET STATUS pages).
+function ramRemoteSwOk(sw) {
+	const s = (sw || '').toUpperCase();
+	return !!s && (s === '9000' || s === 'CAFE' ||
+		['61', '62', '63'].indexOf(s.slice(0, 2)) >= 0);
+}
+
 // GET STATUS APDU for the compact listing format: P2.b2=0 (GP Card Spec
 // v2.3.1 11.4.2.2) with the mandatory '4F00' search criterion (all
 // occurrences) and a chained GET RESPONSE (00C0000000) in the same secured
diff --git a/frontend/sw.js b/frontend/sw.js
index e4d2c5d..6d08cd9 100644
--- a/frontend/sw.js
+++ b/frontend/sw.js
@@ -1,4 +1,4 @@
-const CACHE = 'simple-v279';
+const CACHE = 'simple-v280';
 const URLS = [
   'index.html',
   'help.html',
diff --git a/frontend/tests/ram.test.js b/frontend/tests/ram.test.js
index 6feac18..a2da085 100644
--- a/frontend/tests/ram.test.js
+++ b/frontend/tests/ram.test.js
@@ -23,6 +23,7 @@ function extractFunc(src, name) {
 
 // Extract chain builder functions and dependencies
 const FNS = ['berLenStr', 'buildApdu', 'escHtml', 'esc', 'chainInit', 'chainRamBuildRowHex', 'ramFmtLifecycle', 'ramFmtPrivileges', 'ramRenderExploreHtml', 'ramStepLine', 'ramGetStatusApdu', 'ramDeleteApdu',
+	'ramRemoteSwOk', 'spPorAccepted', 'ramIncrementCntr', 'ramDeleteFromExplorer',
 	'_parseRawElfEntry', '_parseRawAppEntry', 'ramParseElfStatus', 'ramParseAppStatus', 'parseTLV', '_parseE3Entry',
 	'ramCardIdxAfterRemove', 'ramClearResults', 'ramHideProgress', 'ramOpChanged', 'ramRender', 'ramApplyCard', 'ramExecute',
 	'jcAidNorm', 'jcAidName', 'jcAidSuffix', 'jcAidHtml'];
@@ -429,3 +430,74 @@ test('ramDeleteApdu builds the GP DELETE with the 4F AID TLV and Le (F0414C46416
 	// the dead helper reference must not come back
 	assert.ok(!html.includes('_ber_len('), 'undefined _ber_len() call is back');
 });
+
+test('ramRemoteSwOk mirrors the server success set', () => {
+	for (const sw of ['9000', '6113', '62F1', '6310', 'CAFE']) {
+		assert.ok(ramRemoteSwOk(sw), sw);
+	}
+	for (const sw of ['6700', '6F00', '6A88', '', null]) {
+		assert.ok(!ramRemoteSwOk(sw), String(sw));
+	}
+});
+
+function stubDeleteEnv(sendResult) {
+	// ramShowProgress/ramHideProgress are the real extracted helpers
+	const els = fakeRamDocument(['ram-result', 'ram-steps', 'ram-progress', 'ram-progress-text']);
+	const calls = { refresh: [], saved: [], sent: [], explored: null };
+	globalThis.t = s => s;
+	globalThis.spRefreshFromPreset = sel => { calls.refresh.push(sel); };
+	globalThis.getRamSpParams = () => ({ cntr: '0000000005', kicKey: 'AA', kidKey: 'BB' });
+	globalThis.confirm = () => true;
+	globalThis.alert = () => {};
+	globalThis.ramShowProgress = () => {};   // not part of the extracted FNS
+	globalThis.ramSendOta = async (apdu, sp) => {
+		calls.sent.push({ apdu: apdu, cntr: sp.cntr });
+		return sendResult;
+	};
+	globalThis.ramSaveCntr = c => { calls.saved.push(c); };
+	globalThis.ramExplore = async sp => { calls.explored = sp.cntr; };
+	return { els, calls };
+}
+
+function unstubDeleteEnv() {
+	for (const k of ['getRamSpParams', 'confirm', 'alert', 'ramShowProgress',
+		'ramSendOta', 'ramSaveCntr', 'ramExplore']) {
+		delete globalThis[k];
+	}
+	globalThis.spRefreshFromPreset = () => '';   // the top-level stub
+}
+
+test('ramDeleteFromExplorer refreshes the preset and continues from the consumed counter', async () => {
+	const { els, calls } = stubDeleteEnv({ success: true,
+		por: { response_status: 'por_ok', decoded: { last_status_word: '9000' } } });
+	await ramDeleteFromExplorer('F0414C46416101', true);
+	assert.deepStrictEqual(calls.refresh, ['ram-card-sel'],
+		'the preset must be re-read before the operation');
+	assert.strictEqual(calls.sent.length, 1);
+	assert.ok(calls.sent[0].apdu.startsWith('80E40080'), calls.sent[0].apdu);
+	assert.strictEqual(calls.sent[0].cntr, '0000000005');
+	assert.deepStrictEqual(calls.saved, ['0000000006'],
+		'the accepted packet advances the saved counter');
+	assert.strictEqual(calls.explored, '0000000006',
+		'the re-explore must start from the consumed counter, never replay it');
+	assert.strictEqual(els['ram-result'].textContent, 'OK');
+	unstubDeleteEnv();
+});
+
+test('ramDeleteFromExplorer leaves the counter untouched on a rejected packet', async () => {
+	const { calls } = stubDeleteEnv({ success: true, por: { response_status: 'cntr_low' } });
+	await ramDeleteFromExplorer('F0414C46416101', false);
+	assert.deepStrictEqual(calls.saved, [], 'a rejected packet must not advance the counter');
+	assert.strictEqual(calls.explored, null, 'no re-explore after a rejected delete');
+	unstubDeleteEnv();
+});
+
+test('ramDeleteFromExplorer advances but does not re-explore on a failed remote command', async () => {
+	const { calls } = stubDeleteEnv({ success: true,
+		por: { response_status: 'por_ok', decoded: { last_status_word: '6A88' } } });
+	await ramDeleteFromExplorer('F0414C46416101', false);
+	assert.deepStrictEqual(calls.saved, ['0000000006'],
+		'the card consumed the packet, so the counter still advances');
+	assert.strictEqual(calls.explored, null, 'a failed DELETE must not re-explore');
+	unstubDeleteEnv();
+});
diff --git a/pyproject.toml b/pyproject.toml
index 952489e..b2dd372 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "pysim-simple-server"
-version = "3.6.6"
+version = "3.6.7"
 description = "HTTP REST server wrapping pysim for the SIMple PWA"
 requires-python = ">=3.8"
 # pysim is a git-only dependency installed explicitly by setup.bat/setup.sh.
diff --git a/pysim_simple_server/server.py b/pysim_simple_server/server.py
index d20f051..102777e 100644
--- a/pysim_simple_server/server.py
+++ b/pysim_simple_server/server.py
@@ -31,7 +31,7 @@ from osmocom.tlv import BER_TLV_IE
 from osmocom.utils import rpad
 
 
-VERSION = '3.6.6'
+VERSION = '3.6.7'
 
 MAX_ENVELOPE_SEGMENTS = 5  # max SMS segments for outgoing C-APDU in ENVELOPE