my imei unknown

htc one m7 5.0.2 lollipop
locked
M7_U PVT SHIP S-ON RH
HBOOT-1.61.0000
RADIO--4T.35.3218.16
OpenDSP-V35.120.274.0718
OS-7.19.401.121
eMMC-BOOT 2048MB
Apr 24 2015.17:42:43.0
my device imei problem lollipop ı want to downgrade hboot or rom .what must ı do? :(