a5_dwg correct firmware

Code:

C:\Program Files (x86)\Minimal ADB and Fastboot>fastboot getvar all
(bootloader) version: 0.5
(bootloader) version-bootloader: 3.18.0.0000
(bootloader) version-baseband: 1.31.50.0624_2
(bootloader) version-cpld: None
(bootloader) version-microp: None
(bootloader) version-main: 1.50.8888.3
(bootloader) version-misc: PVT SHIP S-OFF
(bootloader) serialno: HC48WMZE0089
(bootloader) imei: 353030072978893
(bootloader) imei2: 353030072975881
(bootloader) meid: A1000032DAE99F
(bootloader) product: a5_dwg
(bootloader) platform: hTCBmsm8226
(bootloader) modelid: 0P9C50000
(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: 99937bd6
(bootloader) hbootpreupdate: 11
(bootloader) gencheckpt: 0
all: Done!
finished. total time: 0.037s

i have downloaded twrp back file , but unable to install twrp