Tình hình là chat với HTC, họ trả lời thế này:
14:47:44 [Bella Yu] :
Hi, this is Bella, how may I assist you?
14:47:52 [Bella Yu] :
Hi Mr Tan
14:47:58 [Mr Tan] :
hi
14:48:27 [Mr Tan] :
pls suport me, we have some issue with unlock bootloader
14:48:30 [Bella Yu] :
Ok
14:49:57 [Mr Tan] :
I had just unlock bootloader completely (via HTCdev), but we can not install recovery and root ROM
14:50:30 [Mr Tan] :
after check in Hboot, i saw unlocked
14:50:54 [Mr Tan] :
i am using 2.3.4, asia version
14:51:27 [Bella Yu] :
Yes sir , unlook bootloader means refresh your ROM
14:51:44 [Bella Yu] :
That may invalid your wararnty sir
14:52:02 [Mr Tan] :
yes i know
14:53:11 [Mr Tan] :
if we unlock bootloader, we can install recovery and root rom
14:53:25 [Mr Tan] :
we can upgrade any ROM
14:53:40 [Mr Tan] :
we can change anything in system
14:53:43 [Bella Yu] :
Could you please hold on for a while? I will check it for you.
14:53:58 [Mr Tan] :
but now, i can not do anything
14:56:17 [Bella Yu] :
Ok sir
14:56:27 [Bella Yu] :
I 've checked with our engineer
14:57:37 [Bella Yu] :
he said after you unlook the bootloader you can not install recovery and root rom
14:58:03 [Mr Tan] :
really?
14:58:31 [Mr Tan] :
what do happen after we unlock bootloader?
14:58:37 [Bella Yu] :
Yes, if you want to refresh root rom agian you have to send your phone to our care centre for servicing
14:59:47 [Mr Tan] :
what is different between unlock and not yet unlock bootloader
15:00:20 [Bella Yu] :
Could you please hold on for a while? I will check it for you.
15:01:42 [Mr Tan] :
because i join XDA forum, everybody tell me after we unlock bootloader , we can change anything in system, can upgrade any ROm, and can do anything
15:02:00 [Bella Yu] :
Yes, sir , after unlock the bootloader you can refresh third part ROM
15:06:22 [Mr Tan] :
that' mean, we only install any SHIP ROM, can not install recovery, can not root ROM to do anything in system?
15:08:01 [Bella Yu] :
yes
15:10:02 [Bella Yu] :
After the bootloader you can refresh some third part ROM or something else, but if you encourter some issue after unlooked, we do not have resposibilty to service you agian.
15:10:02 [Mr Tan] :
ok thanks. So we don't need unlock bootloader. Because it is not helpfull.
15:10:30 [Bella Yu] :
Yes sir . that's right
15:12:21 [Mr Tan] :
yes, i had readed this regulator after we submit unlocking question. I don't consider to warranty, i only want to unlock bootloader.
15:12:28 [Mr Tan] :
thanks for your support
15:12:47 [Bella Yu] :
You're welcome,
Is there anything else I can help you with?
15:13:02 [Mr Tan] :
no, thank a lot
15:13:24 [Bella Yu] :
Thank you for contacting HTC
Should you have any further inquiries, please don’t hesitate to contact with us again. Goodbye.
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Tóm lại là unlock bootloader từ HTC chì dùng để cài lại 1 số ROM ship thôi, chứ không thể recovery và root. Chán