Cannot find ROM/RUU for my phone

Looking for Stock ROM/RUU

C:\adb>fastboot getvar all
INFOversion: 0.5
INFOversion-bootloader: 3.19.0.0000
INFOversion-baseband: 01.01.010_U10305041_08.01.51015
INFOversion-cpld: None
INFOversion-microp: None
INFOversion-main: 3.17.709.3
INFOversion-misc: PVT SHIP S-ON
INFOserialno: HT547YC00486
INFOimei: 355385062514720
INFOimei2: 355385062514738
INFOmeid: 00000000000000
INFOproduct: a51_dtul
INFOplatform: hTCBmsm8939
INFOmodelid: 0PFJ12000
INFOcidnum: HTC__621
INFObattery-status: good
INFObattery-voltage: 0mV
INFOpartition-layout: Generic
INFOsecurity: on
INFObuild-mode: SHIP
INFOboot-mode: FASTBOOT
INFOcommitno-bootloader: ada7f04c
INFOhbootpreupdate: 11
INFOgencheckpt: 0
INFOmfg-name: 0001
all: Done!

Previously was on Android 6

Any help will be fantastic, currently only have recovery and fastboot

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