Default help

someone came to me looking for help but im not so sure what to do. The persona has a galaxy s4 i1337m in the compilation muamdj, , but when i put the cellphone in download mode says, knox warrany void 0x1 knox kernel lock 0x0 write protection enabled, im not sure if i can flash the 4.2.2 firmware, becase that information makes me think cellphone was in 4.3 and somehow somebody manage to downgrade to 4.2.2. Looking gor info thx for ur attention