The gift one can be converted to gen 1 format but the teh ones can't.
AFAIK if you have IR's .syx files in Axe-Fx II format, you can convert them to Standard/Ultra format in 2 steps without owning or using an Axe-Fx II.
1. Convert to 32bit wav
Use JoJos_Sysex_IR-Converter_v1.1 to convert from .syx 'Axe-Fx II format' to .wav '32bit wav' file.
2. Convert to AF1 .syx format
Use Ownhammer Axe-O-Matic to convert from .wav '32bit wav' to .syx 'Axe-Fx Std/Ultra 32bit floating point (FW10-11)' format file.