I found information indicating that the 1GB, 2GB, and 4GB RAM versions use different DRAM memory chips, which appears to cause incorrect startup settings on the 1GB version. Details can be found here: https://luotianyi.vc/8777.html I therefore decided to return the board and wait until the 2GB or 4GB versions become available again. Rolf

I'm flashing the image to a microSD card using Armbiam Imager doesn't boot: works OK:

my model without emmc (3 ram + 0 emmc). Could that be the reason? I apologize for the misinformation; I checked my board, and the revision number isn't listed there either.

Could you tell me where you found the revision number? I don't see anything written on my board.

no, it have secureboot, emcp 1,5gb instead 1 or 2gb ram, i tried to boot x96q lpddr3 + secure patch + orangepi zero3 1,5gb patch but at uboot it allway say 2gb ram 0g effective. uboot spl load 1,5gb ram correctly