09-24-2022, 09:34 AM
OK, you are right, somehow the SPI has an auyfan SPI uboot on it
the SPI chip is labeled (on mb) U18
notch
1....8
2....7
3---6
4...5
4 = gnd,, 8 = 3V,,, 6=clock,,, you could verify with DVM
next to reset button is "recovery" button, this is supposed to short clock to ground
you could also verify this with DVM
So, with a for sure bootable SD in, hold recovery button 5+ sec during startup
then install mtd-utils,,,, mtd_debug info /dev/mtd0 ; mtd_debug erase /dev/mtd0 0 16777216
if the button is flakey (known problem), wiggle as you push, or else use fine pointed tweezers to short 6->4
if the points are sharp, less chance of tweezer slipping
All this from before starup ,, for 5 seconds
the SPI chip is labeled (on mb) U18
notch
1....8
2....7
3---6
4...5
4 = gnd,, 8 = 3V,,, 6=clock,,, you could verify with DVM
next to reset button is "recovery" button, this is supposed to short clock to ground
you could also verify this with DVM
So, with a for sure bootable SD in, hold recovery button 5+ sec during startup
then install mtd-utils,,,, mtd_debug info /dev/mtd0 ; mtd_debug erase /dev/mtd0 0 16777216
if the button is flakey (known problem), wiggle as you push, or else use fine pointed tweezers to short 6->4
if the points are sharp, less chance of tweezer slipping
All this from before starup ,, for 5 seconds