Hi @jwsong,
Thanks for reporting this problem. I just observed a failure when attempting to flash a ~1.3 MB onto an Unexpected Maker FeatherS3 board. I’m using the wiring from this post. The behavior they were seeing in that post seems similar to what you’ve described here. That poster came up with a workaround, but I really don’t think you should have to split up the binary like they’ve done for this to work. I’m going to see what I can do to fix this in the Notecard firmware.
In the meantime, when you get a chance, could you please follow the steps in this post, specifically either the “Manual Trace - Notecard Playground” or “Manual Trace - Serial Terminal App” sections, and let me know what you see in the resulting log when you attempt to ODFU your 1.5 MB image?
Thanks for your patience!
Hayden Roche
Blues staff firmware engineer