TLDR: U-BOOT RECOVERY MODE IS THE ONLY WAY TO FLASH RELIABLY. PUBLIC RELEASE BUILDS ARE TOO BIG FOR 4 MB
Hi all,
It feels like I'm following in the footsteps of @SaltwaterC, who figured out support for this router nearly 5 years ago !!!! As difficult as this was, most of the work was already done for me. Special thanks to him and also @pupie (another forum post from ages ago) for inspiration that Flash upgrades are possible. Also special thanks to @Jeff for the JEDEC ID solution