[HTC 10 Guides, News, & Discussion] Elfjes:
Thanks for your response. Alas, no luck yet. I tried both a WWE 401 RUU and a TMOB 101/111 RUU (live outside US) but neither provided me with a working carrier partition.

C:\Android\com>htc_fastboot flash zip 2PS6IMG_PERFUME_UHL_O80_SENSE90GP_MR_TMO_DE_3.18.111.2_Radio_2.0.U010241a_at_71204_84.09_F_release_521044_combined_signed.zip

htc_fastboot v3.0.9.2 (2015-05-29)

target rom version: 3.18.111.2

found large-zip header, file count: 26

processing file 1/26...

sending 'zip' (208258 KB)...

OKAY [ 10.750s]

writing 'zip'...

(bootloader) HOSD CL#1012001

(bootloader) update GPT (gpt_main_32g.img) successfully.

(bootloader) Perform pre-update

(bootloader) WARN Skip partition_info due to unmatched partition name

(bootloader) WARN Skip lockbooter.img due to unmatched partition name

(bootloader) WARN Skip backup_android-info.txt due to unmatched partitio

(bootloader) n name

(bootloader) get 34 images from zip(zip_type=3)

(bootloader) start@34

(bootloader) apppreload.img@BYPASS

(bootloader) aboot_signed.img@100%

(bootloader) cota.img@BYPASS

(bootloader) xbl-8996-1.img@100%

(bootloader) hosd_signed.img@100%

(bootloader) apdp-8996-1.img@BYPASS

(bootloader) rpm-8996-1.img@100%

(bootloader) pmic-8996-1.img@100%

(bootloader) boot_signed.img@BYPASS

(bootloader) recovery_signed.img@BYPASS

(bootloader) slpi.img@BYPASS

(bootloader) adsp.img@BYPASS

(bootloader) dsp.img@BYPASS

(bootloader) rcdata.img@BYPASS

(bootloader) rfg_3.img@BYPASS

(bootloader) venus.img@BYPASS

(bootloader) modemst1.img@BYPASS

(bootloader) modemst2.img@BYPASS

(bootloader) fsc.img@BYPASS

(bootloader) tz-8996-1.img@100%

(bootloader) hyp-8996-1.img@100%

(bootloader) devcfg-8996-1.img@100%

(bootloader) lksecapp.img@100%

(bootloader) cmnlib32.img@100%

(bootloader) cmnlib64.img@100%

(bootloader) keymaster.img@100%

(bootloader) pg2fs_ship_signkey.img@100%

(bootloader) sensor_hub.img@BYPASS

(bootloader) tp_SYN3708.img@BYPASS

(bootloader) cs_CY8C.img@BYPASS

(bootloader) splash1.nb0@BYPASS

(bootloader) usb_typec_otp.img@BYPASS

(bootloader) usb_typec_otp_ad.img@BYPASS

(bootloader) radio.img@BYPASS

FAILED (remote: 90 hboot pre-update! please flush image again immediately )

finished. total time: 13.484s

preupdate done, rebooting...

resending command...

< waiting for device >

sending 'zip' (208258 KB)...

OKAY [ 10.722s]

writing 'zip'...

(bootloader) HOSD CL#1014340

(bootloader) GPT (gpt_main_32g.img) is up-to-dated. [17408]

(bootloader) WARN Skip partition_info due to unmatched partition name

(bootloader) WARN Skip lockbooter.img due to unmatched partition name

(bootloader) WARN Skip backup_android-info.txt due to unmatched partitio

(bootloader) n name

(bootloader) get 34 images from zip(zip_type=3)

(bootloader) start@34

(bootloader) apppreload.img@21%

(bootloader) apppreload.img@42%

(bootloader) apppreload.img@63%

(bootloader) apppreload.img@84%

(bootloader) apppreload.img@100%

(bootloader) aboot_signed.img@100%

(bootloader) cota.img@100%

(bootloader) xbl-8996-1.img@100%

(bootloader) hosd_signed.img@100%

(bootloader) apdp-8996-1.img@100%

(bootloader) rpm-8996-1.img@100%

(bootloader) pmic-8996-1.img@100%

(bootloader) boot_signed.img@100%

(bootloader) recovery_signed.img@100%

(bootloader) slpi.img@100%

(bootloader) adsp.img@100%

(bootloader) dsp.img@100%

(bootloader) rcdata.img@100%

(bootloader) rfg_3.img@100%

(bootloader) venus.img@100%

(bootloader) modemst1.img@100%

(bootloader) modemst2.img@100%

(bootloader) fsc.img@100%

(bootloader) tz-8996-1.img@100%

(bootloader) hyp-8996-1.img@100%

(bootloader) devcfg-8996-1.img@100%

(bootloader) lksecapp.img@100%

(bootloader) cmnlib32.img@100%

(bootloader) cmnlib64.img@100%

(bootloader) keymaster.img@100%

(bootloader) pg2fs_ship_signkey.img@100%

(bootloader) splash1.nb0@100%

(bootloader) sensor_hub.img@BYPASS

(bootloader) radio.img@100%

(bootloader) tp_SYN3708.img@BYPASS

(bootloader) cs_CY8C.img@BYPASS

(bootloader) usb_typec_otp.img@BYPASS

(bootloader) usb_typec_otp_ad.img@BYPASS

(bootloader) Update zip file OK

(bootloader) end@Done

OKAY [ 23.249s]

finished. total time: 33.971s

processing file 2/26...

sending 'zip' (98819 KB)...

OKAY [ 4.656s]

writing 'zip'...

(bootloader) HOSD CL#1014340

(bootloader) get 1 images from zip(zip_type=3)

(bootloader) start@1

(bootloader) system.img_00@44%

(bootloader) system.img_00@89%

(bootloader) system.img_00@100%

(bootloader) Update zip file OK

(bootloader) end@Done

OKAY [ 5.094s]

...

writing 'zip'...

(bootloader) HOSD CL#1014340

(bootloader) get 1 images from zip(zip_type=3)

(bootloader) start@1

(bootloader) system.img_23@67%

(bootloader) system.img_23@100%

(bootloader) Update zip file OK

(bootloader) end@Done

OKAY [ 3.750s]

finished. total time: 8.437s

processing file 26/26...

sending 'zip' (21889 KB)...

OKAY [ 2.047s]

writing 'zip'...

(bootloader) HOSD CL#1014340

(bootloader) get 3 images from zip(zip_type=3)

(bootloader) start@3

(bootloader) cache.img@29%

(bootloader) cache.img@58%

(bootloader) cache.img@88%

(bootloader) cache.img@100%

(bootloader) dzdata_32g.img@100%

(bootloader) boot_signed.img@100%

(bootloader) Update zip file OK

(bootloader) end@Done

OKAY [ 8.328s]

finished. total time: 10.375s

rompack updated

htc_fastboot finished. total time: 299.773s

Things I could try at this point:

- Try format carrier myself to at least make it mountable

- Try a US unlocked RUU in the hope that it contains a valid carrier image for my device (would probably need to change MID)

Somehow I'm concerned about these messages. Do I need to worry about them?

(bootloader) WARN Skip partition_info due to unmatched partition name

(bootloader) WARN Skip lockbooter.img due to unmatched partition name

UPDATE: What fixed it for me was to format /carrier using make_ext4fs in recovery / adb. Could then reflash LOS16 (just to be sure) and boot normally. Working fingerprint scanner confirmed oreo firmware.