he tried it all using Iancolemans tool.
Why not try to tell him to connect his ledger to Electrum and follow Lucius's suggestion above(It seems it doesn't work to you).
Or get the master public key of that wallet and use a tool called xPub analyzer you can find it here
https://blockpath.com/wallets/new?action=appxpubIt could scan all possible paths and find the used addresses.
Another option is the tool from Ledger they have their own xPub scanner created a few months ago and this should be the tool you must use if you want to recover your wallet.
Here's the link:
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https://blockpath.com/wallets/new?action=appxpubHi thx for your reply.
Tried all those things, up to three times just to make sure.
The only possible things i can think of is letting somebody write a python script that makes derivations from m/0 up to m/49'/2000'/2000'/2000/2000 ans see if that works
I think that somehow there was indeed a problem with derivation BTC-LTC and i think it is Google Chrome related, that's why people with different HW wallets (Trezor and Ledger) had the EXACT same problem in the EXACT same period.
Apart from the fact that i like a challenge finding the solution could help people get their funds back.