M8 sprint imei unknown after flash

[Imeicodes]

i need solution after update firmware 4.4 to 6.0 no imei no baseband

i downgrade again but problem same and when press information button on

xtc2clip show imei in info

Reading information...
Using Fastboot mode...
Reading common information
(bootloader) version: 0.5
(bootloader) version-bootloader: 3.19.0.0000
(bootloader) version-baseband: 1.08.20.0916
(bootloader) version-cpld: None
(bootloader) version-microp: None
(bootloader) version-main: 3.30.651.2
(bootloader) version-misc: PVT SHIP S-OFF
(bootloader) serialno: HT457SF02651
(bootloader) imei: 990004993869282
(bootloader) imei2: Not Support
(bootloader) meid: 99000499386928
(bootloader) product: m8_whl
(bootloader) platform: hTCBmsm8974
(bootloader) modelid: 0P6B7****
(bootloader) cidnum: 11111111
(bootloader) battery-status: good
(bootloader) battery-voltage: 0mV
(bootloader) partition-layout: Generic
(bootloader) security: off
(bootloader) build-mode: SHIP
(bootloader) boot-mode: FASTBOOT
(bootloader) commitno-bootloader: 8a0f02ff
(bootloader) hbootpreupdate: 11
(bootloader) gencheckpt: 0
all: Done!
Execution time is 55(ms)
Reading CID information
... (bootloader) cid: 11111111
OKAY
Execution time is 14(ms)
Reading MEID information
... (bootloader) meid: 99000499386928
OKAY
Execution time is 14(ms)
Reading IMEI1 information
... (bootloader) imei: 990004993869282
OKAY
Execution time is 18(ms)
Reading IMEI2 information
... (bootloader) readimei2: Not Support
OKAY
Execution time is 14(ms)
Reading secure flag information
... (bootloader) secure_flag: 0
OKAY
Execution time is 14(ms)
Reading serial number information
... (bootloader) [ERR] Command error !!!
OKAY
Execution time is 15(ms)
Read information completed.

[xtc2clip]

Hello,

Might be silly, but did you try factory reset?

[Imeicodes]

yes factory reset but still same condition before flashing phone working fine

on 4.4.2 version after update no imei no baseband and phone rebooting in language

but when i read phone info in xtc software there is show both imei and baseband