@kagourakos
Using an RGN is marginally safer imo PROVIDED THAT the file's safe-naming of XXXX01000xxx is respected. That's because the relevant regions are flashed directly from an RGN whereas the use of a GCD file adds an extra step, firstly the GUPDATE.GCD file is written to the device, then it's detected by the device's software on next boot and if found to be a version higher than the fw already loaded it will be initiated to flash the relevant regions. Should the GCD file be corrupted during transfer or it's incomplete it may soft-brick the device due to the device not being able to properly 'read' it during the boot cycle. That results in a boot-loop, spontaneous powering off or freezing on splash screen. Rarely happens and easy to fix of course anyway.