Bricked? Pinebook Pro using Uboot-pbp

[hanmorten]

I've gotten into this state previously, a serial console would help. For me, I could not boot from the SD card, because the MMC was corrupt. To solve it, you can flip the switch to turn eMMC off, and try to flip it on before the SD card's linux kernel does detection. This will boot from SD and leave the eMMC available to flash.

Hello. i did read somthing about this yesterday. But didnt know if it was a risky thing to do. dont want to toast it...hehe
do you have any guideline or link for the process?
the charging of battery overnight didnt work, and i think it a corrupt MMC, or data on it!
think this it the next step..