1. TV has no Content library to run FFB
2. Alternative firmware menu is hidden - no chance to activate it.
3. Latest firmware deletes u-boot (it is not functional on those models) - no u-boot access at all.
4. Latest firmware changes kernel to block access to TOP debug menu over ExLink cable.
So all known ways to roll-back firmware are disabled if you flashed the latest firmware.
Thanks gao_atc from forum.ixbt.com, who ported hack for C550 to B550 and other T-CHL5DEUC models.
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Important: method is tested and works IF you have upgraded your TV and you know, that here exist alternative firmware on it (T-CHL5DEUC-2009_Step1). If you bought TV and/or you are not sure if here is step1 firmware on TV - you get 100% bricked TV in this way!
If you have T-CHL5DEUC-2009_Step1 as the latest firmware (active), but you didn`t flashed the very latest, you can skip step1 in this How-To.
Step 1 - Activate alternative firmware to rollback from T-CHL5DEUC-2010.1_Step2
Download prepared files
Files you need are in /T-CHL5DEUC-2008.0-v.24-auto-arfix2-net/Step-1 directory:
You need only one USB prepared from one of these archives - choose method you prefer.
- T-CHL5DEUC-?hannelImport.tar.gz - archive of ext3 partition with required symlinks to unpack to ext3 formated USB, under linux (ubuntu or other) as root.
- T-CHL5DEUC-?hannelImport.rar - Image of USB with symlinks on it to activate Alternative Firmware by importing Channel settings. It was made with Acronis True Image Home 2009 - this program you can use under windows to make USB disk. After you restore image, you find one whole ext3 partition on it (not visible under Windows!)
1.1. TV is OFF. Attach prepared USB to it and power on TV
1.2. Activate ??hannel Import/Export? menu.
1.3. Select ?USB to TV? and press Enter twice.
1.4. After you get ?Completed successfully...? press exit. If you press Enter here, TV reboots, its ok, go to 1.5.
1.5. Go to Firmware upgrade menu and activate alternative firmware. TV reboots in to alternative, T-CHL5DEUC-2009_Step1 firmware. Do not worry, in Firmware upgrade menu isn`t any alternative firmware again. It is normal.
Step 2 - Restore partitions on TV for correct TOP Debug Menu (TDM) and u-boot access over ex-link.
Make this step just after you successfully finished Step-1. If not - you do not have success and TV won`t accept firmware below.
Files you need are in /T-CHL5DEUC-2008.0-v.24-auto-arfix2-net/Step-2
- T-CHL5DEUC_2010.1_Step2-Set.rar Images you require to restore on TV. Here is the latest kernel from aris69 with network support (09/12/2010, u-boot.bin and onw.bin image. Basis of this upgrade USB is Step2.exe original firmware.
- T-CHL5DEUC_2010.1_Step2.exe Original latest samsung`s firmare
2.1. Extract to fat32 formated USB original firmware (T-CHL5DEUC_2010.1_Step2.exe) and attach USB to TV, choose Upgrade Firmware
2.2. After TV finds firmware 2010.1 on it, decline it, pres cancel (it is very important)
2.3. Do not power off TV, remove USB, delete all content from this USB.
2.3.1. Extract T-CHL5DEUC_2010.1_Step2-Set.rar to the same USB.
2.3.2. Attach this USB to TV (here is T-CHL5DEUC on root of USB and few files)
2.4. Let TV find new 2010.1 firmware and confirm for upgrade. (press OK)
After TV flashes new firmware and reboots, You be able access u-boot and TOP debug menu over ExLink
Step 3 - Flash new firmware. Roll back from 2009_Step1 to T-CHL5DEUC-2008v24-auto-arfix2
Here is an pre-Februar firmware v.2008.0 patched with samygo patcher v.0.24 + ArFix_v2 is incorporated to exeDSP.
N.B. Firmware files in this step are unXORed, if you place xored firmware, you brick TV.
3.1. Get ExLink cable and set Watchdog off and rs232 Jack to debug as on Wiki.
3.2. Files you need are in /T-CHL5DEUC-2008.0-v.24-auto-arfix2-net/Step-3
- T-CHL5DEUC-2008v24-auto-arfix2-decod.rar - unxored T-CHL5DEUC-2008.0 patched firmware + ArFix2
3.4. Connect ExLink and estabilish connection to TV`s console over TOP debug menu. (here is telnet client - putty in archive.)
3.4.1. Parameters to set in terminal:
Code: Select all
Speed: 115200
Data bits: 8
Stop bits: 1
Parity: None
Flow control: None
Code: Select all
debug
1198282
Code: Select all
Ctrl+c
3.4.3. Next:
Code: Select all
cd /mtd_boot
Code: Select all
sh +x usb
After reboot you get active firmware -T-CHL5DEUC-2008. On the inactive(hidden) partition will be the T-CHL5DEUC-2009.
It is strongly recommended to upgrade prefebruar firmware once again to delete 2009_step1 from alternative firmware partition (to avoid accidental activation...)
Archive contains very early firmware, T-CHL5DEUC-1008, you can flash it and activate 2008 patched firmware from menu again