Add README FAQ and align license headers

README.md

@@ -57,6 +57,16 @@ This README intentionally avoids deployment-oriented instructions and excludes g
 - Small, modular codebase suitable for further research
 - Research-first project structure with clear scope boundaries
 
+## FAQ
+
+**Where is the `.fap` release?**
+
+The Flipper app is source-first. Build the `.fap` yourself from this repository with `ufbt` so it matches your firmware and local toolchain.
+
+**What if it crashes or behaves oddly?**
+
+The maintainer primarily uses TagTinker on Momentum firmware with asset packs disabled and has not had issues in that setup. If you are using a different firmware branch, custom asset packs, or a heavily modified device setup, start by testing from a clean baseline.
+
 ## How It Works
 
 TagTinker is built around the study of **infrared electronic shelf-label communication** used by fixed-transmitter labeling systems.

protocol/tagtinker_proto.c

@@ -6,7 +6,7 @@
  * 2. Pack pixels into the tag's raw or RLE bitmap format.
  * 3. Wrap those bytes into the IR frames that the tag understands.
  *
- * SPDX-License-Identifier: MIT
+ * SPDX-License-Identifier: GPL-3.0-only
  */
 
 #include "tagtinker_proto.h"

protocol/tagtinker_proto.h

@@ -4,7 +4,7 @@
  * This layer turns barcodes, pixels, and payload bytes into the frames
  * that the Flipper sends over IR to the tag.
  *
- * SPDX-License-Identifier: MIT
+ * SPDX-License-Identifier: GPL-3.0-only
  */
 
 #pragma once

tagtinker_app.c

@@ -7,7 +7,7 @@
  * App by I12BP8 - github.com/i12bp8
  * Research by furrtek - github.com/furrtek
  *
- * SPDX-License-Identifier: MIT
+ * SPDX-License-Identifier: GPL-3.0-only
  */
 
 #include "tagtinker_app.h"