Htc t6ul unknown baseband imei null

Any idea to solve this problem
I flash many regions flash and no new still baseband unknown

product : t6ul
version main : 4.14.841.13
version bootloader : 2.49.0000
version : 0.5
serialno : FA3AXWG01925
imei : 357310050373317
platform : HBOOT-8064
cidnum : 11111111
modelid : 0P3P51000
security : off
battery status : good
battery voltage : 3763mV
build mode : SHIP
partition layout : Generic
version-baseband : 4T.36.3218.06

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