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(Last edited by mshipXZ; 19th January 2014 at 12:05 PM.) Reason: Help me pleasse
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This is to clarify my problem. Sorry if I post too much... Sorry.
I have an Arc S LT18i.

My device boots into normal mode powering on. It can be detected by Sony PC Companion.
I accidentally put the Arc's (LT15i) "TA" onto my Arc S by Octoplus Suite. After that. I can't enter flashmode nor fastboot and there is NO 3G Signals in the phone. But in my Flashtool. Rebooting it into fastboot via adb. Works. I can boot to fastboot via adb mode but when I try pressing the Menu Button while connecting it to a PC it doesen't boot into fastboot. But when i try it via adb mode it boots. I tried all buttons for Flashmode and Fastboot and it doesen't work, this happened after I accidentally put the Arc's (LT15i) "TA" onto my Arc S by Octoplus Suite. Is there anyway I could fix this? CAN I BOOT INTO FLASHMODE BY ADB LIKE FASTBOOT? Please I really need your help. How can I reflash it? CAN I REFLASH using testpoint??? I know that 12W45 is not supported in testpoint by Unlocking or repairing IMEI. BUT IN REFLASHING OR REPAIRING TA will it work. Please help me I beg you guys. Please! Sorry... i'm just a starter...
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If you tried everything and it doesn't work, the only way is to bring it to the repair center...

Microsoft Certified Professional
Sony Ericsson Xperia Arc S(LT18i) - Unlocked BL(CM11) -> INO 2(4.2.2)
Sony PS VITA PCHJ10001(初音ミク Project Diva F Limited Edition)
1.69 - > 1.80 - > 1.81 - > 2.00 - > 2.02 - > 2.11 - > 2.12 -> 2.61 -> 3.00 -> 3.01
Sony PSP - 2006(Original replaced with 2001 MOBO)
3.60 OFW - > 5.00 M33 -> 5.50 Gen D3 -> 6.60 PRO C

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If the phone can be detected by PC Companion (as you mentioned) you should be able to do a reset from there, believe it's done through "Support Zone" which should be the first option and it will wipe all data on your phone.
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