diff --git a/CHANGELOG.md b/CHANGELOG.md
index 705689ae0..8a74d9b9a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -13,6 +13,7 @@
 * OFW: **JS views finished**
 * OFW: BLE: improved pairing security
 * OFW: FeliCa Emulation: Handle certain Polling commands in firmware
+* OFW PR 4287: Fix Ultralight EV1 regression (by @noproto)
 * OFW PR 4271: NFC: **Ultralight C NFC App Key Management, Dictionary Attack** (by @noproto)
 * OFW PR 4265: NFC: **Fix read crash** with unexpectedly large MFC AUTH(0) response (by @WillyJL)
 * OFW PR 4251: CLI: **Fix long delay** with quick connect/disconnect (by @WillyJL)
diff --git a/applications/main/nfc/helpers/protocol_support/mf_ultralight/mf_ultralight.c b/applications/main/nfc/helpers/protocol_support/mf_ultralight/mf_ultralight.c
index aa3cc2e75..5a0c88cf7 100644
--- a/applications/main/nfc/helpers/protocol_support/mf_ultralight/mf_ultralight.c
+++ b/applications/main/nfc/helpers/protocol_support/mf_ultralight/mf_ultralight.c
@@ -151,13 +151,16 @@ static NfcCommand
         if(!mf_ultralight_event->data->auth_context.skip_auth) {
             mf_ultralight_event->data->auth_context.password = instance->mf_ul_auth->password;
 
-            // Only set tdes_key for Manual/Reader auth types, not for dictionary attacks
-            if(instance->mf_ul_auth->type == MfUltralightAuthTypeManual ||
-               instance->mf_ul_auth->type == MfUltralightAuthTypeReader) {
-                mf_ultralight_event->data->key_request_data.key = instance->mf_ul_auth->tdes_key;
-                mf_ultralight_event->data->key_request_data.key_provided = true;
-            } else {
-                mf_ultralight_event->data->key_request_data.key_provided = false;
+            if(data->type == MfUltralightTypeMfulC) {
+                // Only set tdes_key for Manual/Reader auth types, not for dictionary attacks
+                if(instance->mf_ul_auth->type == MfUltralightAuthTypeManual ||
+                   instance->mf_ul_auth->type == MfUltralightAuthTypeReader) {
+                    mf_ultralight_event->data->key_request_data.key =
+                        instance->mf_ul_auth->tdes_key;
+                    mf_ultralight_event->data->key_request_data.key_provided = true;
+                } else {
+                    mf_ultralight_event->data->key_request_data.key_provided = false;
+                }
             }
         }
     } else if(mf_ultralight_event->type == MfUltralightPollerEventTypeAuthSuccess) {