Hacking My modded Oled switch can't reboot OFW

[Kosan_Elma]

(forgive my bad english) I did turn my modded switch to factory settings and formatted microsd card to make it dual NAND.I did everything same with this video but my OFW doesn't reboot and stay in blackscreen.Can you guys help me?
the video:

 

[thesjaakspoiler]

It can be a number of things.
Some emmc brands need extra resistors on the cmd/dat0 lines to work properly.
It can also be 'just' a bad connection.
With a multimeter in diode mode you can check all the required connections.
If you can boot into Hekate, check whether all the battery information is shown.
The Switch doesn't boot into OFW when it cannot read the battery information.

If you have a picofly, collect details (emmc brand, diode readings and some pictures) and post a message in this thread :
https://gbatemp.net/threads/picofly-a-hwfly-switch-modchip.622701/
You can of course also read the last 50 page because your problem shows up quite often.

 

[l7777]

You almost certainly have a fuse and HOS version mismatch. Check the fuses then go into maintenance mode and see what your HOS version is. If it is lower than the fuses say it should be it will refuse to boot.