You can probably try bring it to mobile repair shop.
I had this samsung phone on which died on me and just like that it went into bootloop. I brought it to samsung shop and they told me I have to replace the whole motherboard for it and it cost shit tons of fortune.
A friend of mine who own a mobile shop said he can fix it with lower cost, and just replacing a chip on it. I don't know which chip.
It's just incredible how these 3rd party independent shops can recognize and fix this kind of problem better than the official shop.
It did work afterall but the imei number changed. I don't care since the device was out of warranty anyway and I don't intend to re-sell it anytime soon.
I suppose the storage chip used for this device is similar to those in mobile phones. It might cost you less. The repairman might be able to recognize the chip, if they manage to tear down the whole thing completely.
But this is a quite niche device on which not many people own it, so the repairman won't have much experience dealing with it.
I figure you might as well try it and see what they say, since your device is broken anyway. Less hassle then sending a replacement or resell it on ebay or something. You might get an option to upgrade it to 128gb storage. Heck even in reddit it's said some people upgraded the RAM too.