Not sure why you'd want to format the 465T as NTFS before recovering to FAT32 but that wouldn't have been harmful in all likelihood.

So, are you saying the device has not been formatted at all or it has but hasn't been formatted by RMPrepUSB? It might only seem empty and there's something still there not obvious maybe because you don't have folder options in Windows set like this:

[Only registered and activated users can see links. ]

About the 2757, it may have a damaged USB socket if it only can only enter preboot intermittently. Try other USB cables. Are you sure QuickCure was loaded? Regardless, sometime it doesn't work and you need to use Cure3 made from the actual device firmware. You really need to have consistent and reliable preboot access to load an RGN file anyway.