Repairing a blue screen bricked switch. any suggestions?

Hi guys,
I couldn't resist to buy a blue screen bricked Switch from eBay which is capable of CFW and I want to try to fix it. Otherwise if it will not work I will sell the spare parts.

So here is the current status of the Switch:
I was told by the seller that the Switch was opened and it was tried to disconnect/connect the battery for fixing (I don't know how this should solve any blue screen bricks...). After receiving I noticed additionally that the +/- vol buttons are not correctly working (- is always pressed). Nevertheless, I managed to start Hekate. In Hekate could read out the fuse count of 8 (FW 6.2.0). However, I can not dump anything because the SD slot seems not to be connected. In addition, I saw that the boot0 and boot1 partition sizes are 0 bytes, so I would guess that the previous owner tried to do a downgrade and something went terribly wrong.

Right now, I think about the next steps:
1) I should open the switch and try to see if the SD slot connection is loose
2) I should see why the vol buttons are not correctly working (maybe misfitted in the case?)
3) somehow I should try to restore the original partition layout to manually rebuild the NAND by choidujour.

Regarding the partiton layout I am not sure. I have a working second switch and I know NAND dumps are incompatible but can I use that dump to create the correct partiton layout and then overwrite everything with choidujour afterwards? Or is there any other easier way?

Regarding the 0 byte size of both boot partitions. Might it be possible that the EMMC is defect or not correctly connected? Would Hekate say something like "no EMMC module found"?

Anyone tried to fix a Switch with similar problems? Any further suggestions?

Due to job duties I will not have time to work on the switch until next weekend. So thanks in advance for your suggestions.

 

Sorry, misread

 

The keys are no problem. You can get your biskeys with Hecate dumping tsec and fuse info and use the sdsetup website. Their downgrade guide using choidujour explains how to do that. All other keys one can get with lockpick RCM.

The only problem is the prodinfo.

 

I have a strange error. When I print the partiton layout Hekate stops to work while showing EMMC user partiton table.

Also gptrestore stops after decompressing with a crc32 fail. Any ideas what I could do now?

 

No, I can't proceed. The person who owned the switch before (and disconnected/connected the battery for unknown reasons) accidentally damaged one pin of the SD connector. Or someone has an idea how to fix a broken connector pin/leg?

So I can't proceed with anything. Neither I can't start Lakka nor try to repair NAND.

It's useless for me. I want to sell it to people who need spare parts for repairing stuff. E.g. the screen is in very good condition and without scratches or pixel errors. But I had no time up to now to start an eBay auction.