[One (M7) General] bigrammy:
Sorry for the late reply bro been working the night shift (UK time) :(

Ok this is what I received from the seller.

build.prop excerpt

cat /system/build.prop
ro.ril.oem.ecclist=112,911,999
ro.ril.enable.dtm=1
ro.ril.gprsclass=12
ro.ril.hsdpa.category=24
ro.ril.hsupa.category=6
ro.ril.hsxpa=4
ro.ril.radio.svn=8
ro.ril.disable.fd.plmn.prefix=23402,23410,23411,23420,23594,27202,27205
ro.ril.enable.sdr=1
ro.ril.oem.show.act=0
ro.ril.enable.amr.wideband=1
ro.ril.enable.r8fd=1
ro.ril.disable.cpc=1
ro.ril.multirab.throttling=1
ro.ril.air.enabled=1
ro.product.locale.language=zh
ro.product.locale.region=HK
ro.com.google.clientidbase=android-htc-rev
ro.product.model=HTC One
ro.net.apnwhitelist=none
ro.config.htc.enableCOTA=1
ro.telephony.ipv6_capability=1
ro.ril.enable.pre_r8fd=1
ro.ril.fd.pre_r8_tout.scr_off=2
ro.ril.fd.pre_r8_tout.scr_on=5
ro.ril.fd.r8_tout.scr_off=2
ro.ril.fd.r8_tout.scr_on=5
ro.ril.ltefgi=1594883200
ro.ril.pdpnumber.policy.roaming=3
dev.defaultwallpaper=/system/customize/resource/wallpapers_00.jpg
ro.installbysim=1
# begin build properties
htc.build.stage=2
ro.aa.customizationid=847958
ro.aa.project=M7_UL_K443_SENSE60_MR
ro.prot=true
ro.aa.maincid=HTC__622
ro.aa.modelid=PN0714000
ro.aa.cidlist=HTC__622
ro.aa.rid=175
ro.aa.report=com
ro.aa.skulist=708
ro.aa.taskid=386270
ro.aa.mainsku=708
ro.aa.romver=6.13.708.1
ro.onecid=1
ro.cwkey=HTC__622
# autogenerated by buildinfo.sh
ro.build.id=KTU84L
ro.build.display.id=KTU84L release-keys
ro.build.version.incremental=368747.1
ro.build.version.sdk=19
ro.build.version.codename=REL
ro.build.version.release=4.4.3
ro.build.date=Σ║î 7µ£ê 22 20:58:52 CST 2014
ro.build.date.utc=1406033932
ro.build.type=user
ro.build.user=buildteam
ro.build.host=ABM104
ro.build.tags=release-keys
ro.product.brand=htc
ro.product.name=htc_asia_hk
ro.product.device=m7
ro.product.board=APQ8064
ro.product.cpu.abi=armeabi-v7a
ro.product.cpu.abi2=armeabi
ro.product.manufacturer=HTC
ro.product.locale.language=en
ro.product.locale.region=US
ro.wifi.channels=
ro.board.platform=msm8960
# ro.build.product is obsolete; use ro.product.device
ro.build.product=m7
ro.build.description=6.13.708.1 CL368747 release-keys
# Do not try to parse ro.build.description or .fingerprint
ro.build.description=6.13.708.1 CL368747 release-keys
ro.build.changelist=368747
ro.build.fingerprint=htc/htc_asia_hk/m7:4.4.3/KTU84L/368747.1:user/release-keys
ro.build.characteristics=nosdcard
ro.build.project=M7_UL_K443_SENSE60_MR:386270
ro.build.sku=hTC Asia HK CHT
ro.product.version=6.13.708.1
ro.build.languageremove=0
ro.build.sense.version=6.0
ro.build.version.htcsdk=HTCExt:HTCExtension_Sense60_443_1;SDK:6.25;hdkbase:19.2
ro.build.description=6.13.708.1 CL368747 release-keys
ro.build.fingerprint=htc/htc_asia_hk/m7:4.4.3/KTU84L/368747.1:user/release-keys
keyguard.no_require_sim=1
# end build properties

Fastboot getvar all from the above ROM.

(bootloader) version: 0.5
(bootloader) version-bootloader: 1.61.0000
(bootloader) version-baseband: 4T.35.3218.16
(bootloader) version-cpld: None
(bootloader) version-microp: None
(bootloader) version-main: 7.19.401.2
(bootloader) version-misc: PVT SHIP S-OFF
(bootloader) serialno:
(bootloader) imei:
(bootloader) meid: 00000000000000
(bootloader) product: m7_ul
(bootloader) platform: HBOOT-8064
(bootloader) modelid: PN071****
(bootloader) cidnum: 11111111
(bootloader) battery-status: good
(bootloader) battery-voltage: 4311mV
(bootloader) partition-layout: Generic
(bootloader) security: off
(bootloader) build-mode: SHIP
(bootloader) boot-mode: FASTBOOT
(bootloader) commitno-bootloader: dirty-0e2a13e5
(bootloader) hbootpreupdate: 11
(bootloader) gencheckpt: 0
all: Done!
finished. total time: 0.120s

I went ahead and flashed the Firmware_6.07.1540.2.zip then I flashed the PN07IMG_M7_UL_L50_SENSE60_MR_BrightstarUS_WWE_7.17.1540.21_Radio_4T.35.3218.16_10.33Q.1718.01L_release_431270_signed.zip

This is the getvar with the above installed.

(bootloader) version: 0.5
(bootloader) version-bootloader: 1.61.0000
(bootloader) version-baseband: 4T.35.3218.16
(bootloader) version-cpld: None
(bootloader) version-microp: None
(bootloader) version-main: 7.17.1540.21
(bootloader) version-misc: PVT SHIP S-OFF
(bootloader) serialno:
(bootloader) imei:
(bootloader) meid: 00000000000000
(bootloader) product: m7_ul
(bootloader) platform: HBOOT-8064
(bootloader) modelid: PN071****
(bootloader) cidnum: 11111111
(bootloader) battery-status: good
(bootloader) battery-voltage: 3984mV
(bootloader) partition-layout: Generic
(bootloader) security: off
(bootloader) build-mode: SHIP
(bootloader) boot-mode: FASTBOOT
(bootloader) commitno-bootloader: dirty-8dcc8123
(bootloader) hbootpreupdate: 11
(bootloader) gencheckpt: 0
all: Done!
Execution time is 93(ms)

When I do a manual carrier search it only ever shows 3g and 2g options in the carriers list even though I know 4g ones are available so it's like it does not even recognize 4g let alone try to connect to it :laugh:

Thanks for taking the time to have a look bro it's much appreciated :highfive: