You can still boot LE from internal, right? You can update to 32-bit build without nuking everything. I recommend to update to 64-bit 7.0.3.011 first and afterwards you can "update" from 64-bit to 32-bit build. Just drop .img.gz with device tree for your box into Update folder.
Using the same method but for the 64bit worked perfectly. I'm sorry but, how do I find the update folder? Do I create it in my sd card?
I think I can (technically) move the two files from my sd card to /storage/update if that's the path you meant. But I'm not sure what the SSH commands are to do that. I don't wanna fuck it up :P.