What is best way to recover the BTC in the old wallet?
Jubiter was a hardware wallet and it is defunct now, but according to one review it should be compatible with any other BIP32/BIP39/BIP44 wallet if they used standard derivation paths.
If you already have seed phrase recovery phrase than t should be easy to import them to new hardware wallet, and I would always recommenf something that is open source.
BIP32/BIP39/BIP44 compliant. Restore wallet from any other wallet by using recovery phrases. The restoration process is entirely conducted offline.
https://coinworldstory.com/jubiter-wallet/In looking closer at Tangem I see other people posting who imported from other wallets having issues seeing their balance and some are pointing at Tangem only showing the first address in sequence along the derivation path for the blockchain.
Don't use Tangem wallet that is closed source.
If you like card format I can recommend much better open source Satochip wallet.
Any suggestions on what could be done from here?
Try to find information about derivation paths Jubiter used, maybe from old Jubiter support team.