I personally can't say if it is legal, or not, but it is definitely a gray area, specially using someone else rom, without much credit and their knowledge, at least in the beginning.
I'm sorry, but the simple fact is he is doing something you guy...
C6902 14.1.G.2.257 Generic Thailand cust. 1276-7160_R4A
Thank you, this will be added to the first post shortly.
Sent from my C6903 using XDA Premium 4 mobile app
The link C6903 14.1.G.1.534 Generic TH 1276-7160_R4A on first post should be a C6902. :D
C6902 14.1.G.1.534 Thailand 1276-7160_R4A
Strange! I flashed the Bootloader v4.23 and Radio 1231_0.18.0_0409 and can confirmed that it was correct by checking in the Bootloader screen. On the other hand, when I checked on device in Settings, About tablet, it showed as old radio, 1231_0....