Ohhh Yeahhhhhhh 😀🤪
I found a solution
I had read some post https://theminixforum.com/index.php?threads/minix-u1-bricked.3855/ and https://theminixforum.com/index.php?threads/emmc-reset-pads.4430 / which showed how to put a paper clip or a screwdriver on the motherboard to make a short circuit (...)
Ok, as my U9-H was not working I tried various short circuit until the boot loop froze to show
Load fip header from eMMC, src: 0x0000c200, des: 0x01400000, size: 0x00004000
New fip structure!
Load bl30 from eMMC, src: 0x00010200, des: 0x01100000, size: 0x0000d600
Load bl31 from eMMC, src: 0x00020200, des: 0x10100000, size: 0x00015400
Load bl32 from eMMC, src: 0x00038200, des: 0x05300000, size: 0x0002ee00
Load bl33 from eMMC, src: 0x00068200, des: 0x01000000, size: 0x000ad000
aml log : SIG CHK : 300 for address 0x01000000
reset...
GXM:BL1:dc8b51:76f1a5;FEAT:ADFD718C:0;POC:3;RCY:0;EMMC:0;READ:0;0.0;CHK:0;
TE: 132890
BL2 Built : 14:17:47, Apr 18 2017.
gxl g95dc662 - xiaobo.gu@droid05
set vdd cpu_a to 1120 mv
set vdd cpu_b to 1050 mv
set vddee to 1000 mv
Board ID = 1
CPU clk: 1200MHz
DQS-corr enabled
DDR scramble enabled
DDR3 chl: Rank0+1 @ 912MHz - PASS
Rank0: 1024MB(auto)-2T-13
Rank1: 1024MB(auto)-2T-13
DataBus test pass!
AddrBus test pass!
-s
Load fip header from eMMC, src: 0x0000c200, des: 0x01400000, size: 0x00004000
New fip structure!
Load bl30 from eMMC, src: 0x00010200, des: 0x01100000, size: 0x0000d600
Load bl31 from eMMC, src: 0x00020200, des: 0x10100000, size: 0x00015400
Load bl32 from eMMC, src: 0x00038200, des: 0x05300000, size: 0x0002ee00
Load bl33 from eMMC, src: 0x00068200, des: 0x01000000, size: 0x000ad000
GXM:Fixed PLL lock failed
BL1:dc8b51:76f1a5;FEAT:ADFD718C:0;POC:3;RCY:0;EMMC:400;NAND:81;SD:0;READ:0;CHK:AA;USB:8;0.0;
TE: 16561778
I used usb_burning_tools provided here http://theminixforum.com:9009/firmwares/U9-H-CE_FW001-Android_7.1.2-20191120-Burning_Tool.zip and flashed my U9-H
For the U9-H, I made a short circuit on R32 (see post with pictures)