Board not booting

i have a rockpi s without on-board storage. after an upgrade the board stopped working. using the UART i can see just:

DDR Version V1.26
REGFB: 0x00000032, 0x00000032
Col=10 Bank=8 Row=15 Size=512MB
I tried a different uSD card with all available OS images with no result.
Can anybody give me some debug tips or hints as to how the board can be repaired? It does not seem “dead” - more or less just bricked?!?!

Hi All,

I got 3 RockPiS from the shop and none accept to boot.

On console I only got: “DDR Version V1.26” nothing else, no activity, LED Green fix only.