[One (M9+) General] yvtc75:
I just collected the M9+ files and shared them.

Thanks for all on this forum and M9's ,especially [MENTION=6701598]xiaolongzi[/MENTION] & [MENTION=3088420]tbalden[/MENTION] .

No need to s-off and relock your devices.S-ON is OK.

Use it at your own risk.

I only got the files for TW version and here was my device variable.

CID:HTC__621

MID:0PK711000

E:\M9pw>htc_fastboot getvar all
(bootloader) kernel: lk
(bootloader) product: htc_hiau_ml_tuhl
(bootloader) version: 1.0
(bootloader) imei: zzzzzz...
(bootloader) version-main: 1.84.709.10
(bootloader) boot-mode: download
(bootloader) version-bootloader: 1.01.0000
(bootloader) mid: 0PK711000
(bootloader) cid: HTC__621
all:
finished. total time: 0.005s
htc_fastboot finished. total time: 0.637s

Repack TWRP recovery to backup/restore system image.

Or you could also flash system simply with htc fastboot.

It will elapse long time,not hang.Be patient.

E:\M9pw>[COLOR="Red"]htc_fastboot flash system M9pw_system_1.08.709.4.img[/COLOR]
htc_fastboot v3.0.8a (2015-04-10)
target reported max download size of 800000000 bytes
Invalid sparse file format at header magi
erasing 'system'...
OKAY [ 0.517s]
sending sparse 'system' (779021 KB)...
OKAY [ 73.094s]
writing 'system'...
(bootloader) HOSD CL#549681
(bootloader) start@1
(bootloader) system@100%
(bootloader) Update partition OK
(bootloader) end@Done
OKAY [ 20.873s]
sending sparse 'system' (780715 KB)...
OKAY [ 71.325s]
writing 'system'...
(bootloader) HOSD CL#549681
(bootloader) start@1
(bootloader) system@100%
(bootloader) Update partition OK
(bootloader) end@Done
OKAY [ 20.986s]
sending sparse 'system' (742840 KB)...
OKAY [ 52.445s]
writing 'system'...
(bootloader) HOSD CL#549681
(bootloader) start@1
(bootloader) system@100%
(bootloader) Update partition OK
(bootloader) end@Done
OKAY [ 20.518s]
sending sparse 'system' (773764 KB)...
OKAY [ 54.045s]
writing 'system'...
(bootloader) HOSD CL#549681
(bootloader) start@1
(bootloader) system@100%
(bootloader) Update partition OK
(bootloader) end@Done
OKAY [ 20.707s]
sending sparse 'system' (775393 KB)...
OKAY [ 67.296s]
writing 'system'...
(bootloader) HOSD CL#549681
(bootloader) start@1
(bootloader) system@100%
(bootloader) Update partition OK
(bootloader) end@Done
OKAY [ 20.849s]
sending sparse 'system' (37096 KB)...
OKAY [ 4.051s]
writing 'system'...
(bootloader) HOSD CL#549681
(bootloader) start@1
(bootloader) system@100%
(bootloader) Update partition OK
(bootloader) end@Done
OKAY [ 1.934s]
finished. total time: 428.716s
htc_fastboot finished. total time: 780.562s

If you wanna apply OTA successfully.

0.Backup your system.

Backup your system.

Backup your system. And then get the ball rolling.....

1.restore stock recovery

2.restore unmodified system image

3.receive OTA and apply it.

4.re-rooted and reflashed Xposed if you would like to use them.

E:\M9pw>[COLOR="Red"]htc_fastboot flash recovery recovery_verified.img__TW_1.61.709.3[/COLOR]
htc_fastboot v3.0.8a (2015-04-10)
target reported max download size of 800000000 bytes
sending 'recovery' (9710 KB)...
OKAY [ 1.468s]
writing 'recovery'...
(bootloader) HOSD CL#549681
(bootloader) start@1
(bootloader) recovery@100%
(bootloader) Update partition OK
(bootloader) end@Done
OKAY [ 1.205s]
finished. total time: 2.673s
htc_fastboot finished. total time: 5.350s

E:\M9pw>[COLOR="Red"]htc_fastboot flash system system.emmc.win[/COLOR]
htc_fastboot v3.0.8a (2015-04-10)
target reported max download size of 800000000 bytes
Invalid sparse file format at header magi
erasing 'system'...
OKAY [ 0.915s]
sending sparse 'system' (778345 KB)...
OKAY [ 55.609s]
writing 'system'...
(bootloader) HOSD CL#549681
(bootloader) start@1
(bootloader) system@100%
(bootloader) Update partition OK
(bootloader) end@Done
OKAY [ 20.834s]
sending sparse 'system' (779605 KB)...
OKAY [ 73.650s]
writing 'system'...
(bootloader) HOSD CL#549681
(bootloader) start@1
(bootloader) system@100%
(bootloader) Update partition OK
(bootloader) end@Done
OKAY [ 20.995s]
sending sparse 'system' (745409 KB)...
OKAY [ 94.247s]
writing 'system'...
(bootloader) HOSD CL#549681
(bootloader) start@1
(bootloader) system@100%
(bootloader) Update partition OK
(bootloader) end@Done
OKAY [ 20.291s]
sending sparse 'system' (771737 KB)...
OKAY [ 66.736s]
writing 'system'...
(bootloader) HOSD CL#549681
(bootloader) start@1
(bootloader) system@100%
(bootloader) Update partition OK
(bootloader) end@Done
OKAY [ 20.797s]
sending sparse 'system' (769584 KB)...
OKAY [ 51.970s]
writing 'system'...
(bootloader) HOSD CL#549681
(bootloader) start@1
(bootloader) system@100%
(bootloader) Update partition OK
(bootloader) end@Done
OKAY [ 20.733s]
sending sparse 'system' (81928 KB)...
OKAY [ 6.598s]
writing 'system'...
(bootloader) HOSD CL#549681
(bootloader) start@1
(bootloader) system@100%
(bootloader) Update partition OK
(bootloader) end@Done
OKAY [ 3.039s]
finished. total time: 456.633s
htc_fastboot finished. total time: 1278.643s

E:\M9pw>fastboot reboot
rebooting...

finished. total time: 0.066s