Hacking After downgrade: kernel panic - black screen

[Sucuk60]

Sorry for my bad english! I have a problem. My Switch won‘t boot anymore after downgrade. It only shows me the nintendo or cfw boot logo.
Is there a way to restore boot0 and boot1 without a backup?

 

[TR_mahmutpek]

Try reinstalling your previous firnware via chouidjur.

 

[Kubas_inko]

You have to remake your NAND.
Pretty much this: https://guide.sdsetup.com/#/manualchoidowngrade

 

[Sucuk60]

I couldn‘t install 6.2 with ChoiDu because I got an error:
File "ChoiDujour.py", line 517, in <module>
File "ChoiDujour.py", line 225, in call_hactool
Exception: Error: section 0 is corrupted!

 

[Draxzelex]

ChoiDujour does not support firmware 6.2

 

[Kubas_inko]

In that case, just rebuild 6.1.0 NAND and then update vith choidujourNX or officially to 6.2.0.

 

[Sucuk60]

I tried it with fw 5.1.0. Now I gt another error: urllib2.URLError: <urlopen error [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:726)