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故障手機:HTC 820U
症狀:
觸控面板已碎裂。
開機後,無論如何切換,最後都會停留在 HBOOT 介面 :
前面三行顯示:
Software stats : Modified
Locked
Security Warning
意味,軟體有被修改過。
如果是未修改的原廠機,會顯示兩行:
Software stats : Official
Locked
該機應該是 recovery 被刷壞、系統也被刷壞。所以才會「最後都停留在 HBOOT 介面 」。
因為從 HBOOT 介面進入 FASTBOOT 都沒問題,所以擬定出修理步驟:
1. unlock
2. 刷 recovery
3. 刷 ROM
unlock 後,顯示:
後來刷 recovery ,有成功:
root# fastboot flash recovery twrp28.img
target reported max download size of 16773120 bytes
sending 'recovery' (11716 KB)...
OKAY [ 1.530s]
writing 'recovery'..
OKAY [ 1.386s]
finished. total time: 2.916s
root#
也可以操作。(觸控板碎裂成這樣,還是能觸控,也是神)
之後,有從 Linux 進行一些 fastboot 操作,後來發現無法 Lock:
root# fastboot oem lock
...
(bootloader) [PGFS] partition_update_pgfs: pg1fs_security
(bootloader) TZ_HTC_SVC_ENC ret = 0
(bootloader) [PGFS] partition_update_pgfs: pg2fs_sec_recovery
(bootloader) Lock successfully...
(bootloader) a51dtul_deinit_lcd
(bootloader) mipi display off
(bootloader) TZ_HTC_SVC_DISABLE ret = 536739196 (0x1FFDFD7C)
(bootloader) [ERR] Failed to disable wdog debug: 15
(bootloader) [INFO] Calling SCM to disable SPMI PMIC arbiter
(bootloader) [ERR] Cannot halt SPMI arbiter!!
(bootloader) [INFO] Rebooting device
FAILED (status read failed (No such device))
finished. total time: 6.255s
root#
之後有再刷幾次 recovery ,看它的回應,看似無誤:
root# fastboot flash recovery twrp28.img
target reported max download size of 16777216 bytes
sending 'recovery' (11716 KB)...
OKAY [ 1.419s]
writing 'recovery'...
OKAY [ 0.374s]
finished. total time: 1.794s
root#
但是都無法再次進入 TWRP recovery 了。
所以就沒辦法從 TWRP recovery 來刷 ROM 了。
整理如下:
雖然可以 unlock 、也曾刷入 recovery;
但後來無法 lock、也無法再刷入 recovery。
已經無步繼續救援下去了。
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