Got it, thanks
1700097537
Following instructions In How to set up ISFShax,
Preparing SD card,
step 7 [UDPIH] minute fw.img and boot1.img from jan-hofmeir minute-minute releases
Scrolling in that area
boot1.img is only in the sets of isfshax-rednand-v1.0.1 and isfshax-rednand-v1.0...