[AT&T, Rogers HTC One X, Telstra One XL] Mr Davo:
Thanks exad (for your continued interest / help) -

C:\Program Files\Android SDK\sdk\platform-tools>fastboot flash zip PJ8312000-One
X.zip
sending 'zip' (36064 KB)...
OKAY [ 2.786s]
writing 'zip'...
(bootloader) adopting the signature contained in this image...
(bootloader) zip header checking...
(bootloader) zip info parsing...
FAILED (remote: 99 unknown fail)
finished. total time: 4.307s

C:\Program Files\Android SDK\sdk\platform-tools>fastboot oem boot
...
(bootloader) Boot/Recovery signature checking...
(bootloader) Boot/Recovery signature checking...
(bootloader) setup_tag addr=0x80400100 cmdline add=0xC02F50C4
(bootloader) TAG:Ramdisk OK
(bootloader) TAG:skuid 0x2FD09
(bootloader) TAG:hero panel = 0x4940047
(bootloader) TAG:engineerid = 0x2
(bootloader) TAG: PS ID = 0x0
(bootloader) TAG: Gyro ID = 0x1
(bootloader) Device CID is not super CID
(bootloader) CID is TELST001
(bootloader) setting->cid::TELST001
(bootloader) serial number: HT2B2W301400
(bootloader) command line length =740
(bootloader) active commandline: poweron_status=1 reset_status=0 board_el
(bootloader) ite.disable_uart3=0 diag.enabled=0 board_elite.debug_uart=0
(bootloader) userdata_sel=0 androidboot.emmc=true androidboot.pagesize=20
(bootloader) 48 skuid=0 ddt=20 ats=0 androidboot.lb=1 td.sf=1 td.td=1 td
(bootloader) .ofs=328 td.prd=1 td.dly=0 td.tmo=300 hlog.ofs=628 un.ofs=69
(bootloader) 4 imc_online_log=0 androidboot.efuse_info=NNSL androidboot.
(bootloader) baseband=0.23a.32.09.29 androidboot.cid=TELST001 androidboot
(bootloader) .devicerev=3 androidboot.batt_poweron=good_battery androidbo
(bootloader) ot.carrier=Telstra a
(bootloader) aARM_Partion[0].name=misc
(bootloader) aARM_Partion[1].name=recovery
(bootloader) aARM_Partion[2].name=boot
(bootloader) aARM_Partion[3].name=system
(bootloader) aARM_Partion[4].name=local
(bootloader) aARM_Partion[5].name=cache
(bootloader) aARM_Partion[6].name=userdata
(bootloader) aARM_Partion[7].name=devlog
(bootloader) aARM_Partion[8].name=pdata
(bootloader) aARM_Partion[9].name=fat
(bootloader) aARM_Partion[A].name=extra
(bootloader) aARM_Partion[B].name=reserve
(bootloader) aARM_Partion[C].name=radio
(bootloader) aARM_Partion[D].name=adsp
(bootloader) aARM_Partion[E].name=dsps
(bootloader) aARM_Partion[F].name=wcnss
(bootloader) aARM_Partion[10].name=radio_config
(bootloader) aARM_Partion[11].name=modem_st1
(bootloader) aARM_Partion[12].name=modem_st2
(bootloader) aARM_Partion[13].name=reserve
(bootloader) partition number=20
(bootloader) Valid partition num=20
(bootloader) setting_get_bootmode() = 9
(bootloader) ram size = 0
(bootloader) TZ_HTC_SVC_SET_DDR_MPU ret = 0
(bootloader) smem 90005000 (phy 90005000): TZ_HTC_SVC_UPDATE_SMEM ret = 0
(bootloader) TZ_HTC_SVC_LOG_OPERATOR ret = 0
(bootloader) TZ_HTC_SVC_ENC ret = 0
(bootloader) TZ_HTC_SVC_DISABLE ret = 474079232 (0x1C41E000)
(bootloader) Start Verify: 3
(bootloader) jump_to_kernel: machine_id(3766), tags_addr(0x80400100), ker
(bootloader) nel_addr(0x80408000)
(bootloader) -------------------hboot boot time:27572 msec
FAILED (status read failed (Too many links))
finished. total time: 6.170s

C:\Program Files\Android SDK\sdk\platform-tools>