Hacking Possible bricked due to downgrade (burnt fuse)

dobongo

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How it happened : update firmware to 8.1.0, (fuse count 10). Was using incognito to stop nintendo access. Decided id prefer being online and couldnt remove incognito without a nand backup. The nand backup was when it was on 7.0.0. without realising this i backed it up.
Switch can access rcm only. when booting cfw from payload, screen flashes a few times then blacks out. Switch will not boot into rcm for 45-60mins.

I have so far followed all threads related, coming closest using choidujour on pc. I am attempting to upgrade back to 8.1.0 with this method.
The problem i have is the lockpick_rcm is only recovering keys on my 7.0.0 switch (nand backup), since i backed up to this point.
I am assuming this is why i am getting "missing keys" error on choidujour. I made sure to replace the keys taken off a template with my keys from prod.keys file.
So this is the furthest i have managed to get, following many threads on here and switch.homebrew.guide website.
I have come to accept that this switch life is over, and have bought another unpatched switch (8.1.0).
Now i am wondering, with this new switch, would i able to use the keys off this console anduse them for choidujour to try and fix the other console?
 

dobongo

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If it would be only a problem of the fuse count, you could simply boot to CFW with custom bootlaoder (Hekate).

Im sure i do this everytime using tegrarcm every time i turn off (using jig and pc). Whichever custom bootloader i use, it always has the same result.
So from injecting payload, then launch cfw. Same couple screen flashes showing hekate, then blacked for a long time.
When i do get home il post clear details with images of whats going on for a better understanding
 

pLaYeR^^

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Im sure i do this everytime using tegrarcm every time i turn off (using jig and pc). Whichever custom bootloader i use, it always has the same result.
So from injecting payload, then launch cfw. Same couple screen flashes showing hekate, then blacked for a long time.
When i do get home il post clear details with images of whats going on for a better understanding
Maybe try to clean the sd card and use a fresh atmosphere release.
You could have saved yourself a lot of time if you would simply have created a backup of prodinfo which normally incognito creates automatically.
 

dobongo

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Maybe try to clean the sd card and use a fresh atmosphere release.
You could have saved yourself a lot of time if you would simply have created a backup of prodinfo which normally incognito creates automatically.
Youre right, i might as well begin all steps as
Do you still have your keys? Biskeys especially.
yes sir, 'biskeydump_usb.bin
 

dobongo

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so this is the part i am stuck on currently regarding upgrading firmware via PC. (ChoiDujour)
i followed the edited keys.txt document and replaced the keys with my own, however there are keys missing which i do not have according to the template, which are :
key_area_key_system_source
key_area_key_ocean_source
key_area_key_application_source
header_key

choi.png

now as for redownloading latest firmwares and everything. i did so using sdsetupcom. made sure everything was all up to date.
this time however, hekate now doesnt black out the switch when trying to launch in rcm. it now returns back to rcm. so it shows the logo a few times and returns to rcm options ( like after youve injected payload.) so i guess this is some progress.
 

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