Two things - check solder point - if ways to cpu damaged - no read =no boot
If good - try flash back backup without changes
Check fuses on board.
And first time you read backup twise? If yes compare it.
And dont give up - if otp.bin from your console - softbrick fixable. In theory can be get...
Im upload'ed - sorry for bad english
Im fixed my wiiu with this. If nand not have backup system.xml - its very usefull