[Solved] LExxB679 shuts down after Firmware Downgrade

[eCroFeox]

Hey dudes,

I've got a little problem with my friends' TV. It's an LE40B679 and Firmware 1009.1 was installed. Since SamyGO needs 1008, we decided to downgrade the Firmware.

Everything went fine, so we've been pretty happy. After restarting the TV shuts down after approx. a minute. Then we found a little solution for this problem here on the forum (Bricked LExxB679).

BUT the Solution was to switch back to the other partition to load the 1009 Firmware. But we want to stay on 1008. Does anybody know how we can solve this problem? Maybe deleting the Hashes on bml3 or something? I couldn't find any further information on the forum .

Thanks so much in advance

[juusso]

I could help you if you have telnet access (shell access over console). All what`s needed is to make full dump of your TV's bml partitions (bml0/1-bml0/x),

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bml.dump /dev/bml0/1 /dtv/usb/sda1/bml1.dmp
bml.dump /dev/bml0/2 /dtv/usb/sda1/bml2.dmp
bml.dump /dev/bml0/3 /dtv/usb/sda1/bml3.dmp
bml.dump /dev/bml0/4 /dtv/usb/sda1/bml4.dmp
bml.dump /dev/bml0/5 /dtv/usb/sda1/bml5.dmp
bml.dump /dev/bml0/6 /dtv/usb/sda1/bml6.dmp
bml.dump /dev/bml0/7 /dtv/usb/sda1/bml7.dmp
bml.dump /dev/bml0/8 /dtv/usb/sda1/bml8.dmp
bml.dump /dev/bml0/9 /dtv/usb/sda1/bml9.dmp
bml.dump /dev/bml0/10 /dtv/usb/sda1/bml10.dmp
bml.dump /dev/bml0/11 /dtv/usb/sda1/bml11.dmp
bml.dump /dev/bml0/13 /dtv/usb/sda1/bml13.dmp
bml.dump /dev/bml0/18 /dtv/usb/sda1/bml18.dmp
bml.dump /dev/bml0/19 /dtv/usb/sda1/bml19.dmp
bml.dump /dev/bml0/20 /dtv/usb/sda1/bml20.dmp

you can skip partitions mounted as mtd rwarea, down, tlib. (check by "mount" )
Also this too:

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cat /proc/partitions > /dtv/usb/sda1/output.log
cat /mtd_rwarea/Version* >> /dtv/usb/sda1/output.log
ls -la /mtd_rwarea/PartitionSwitch* >> /dtv/usb/sda1/output.log

zip all, upload to some upload service and give us link for inspection.

p.s. if your USB is recognised not as sda1, check by command and correct commands.

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mount | grep "usb"

Also do you have link to T-CHLCIP6DSEUC 1008.0?

EDIT:
i found i have T-CHLCIP6DSEUC 1007.0 and 1008.0 right on my hdd, so no problem at all. If you have troubles with dumps, i culd prepare special dump maker app, which loads from content library...

[eCroFeox]

Hey,

thank you for your Response. I'm gonna get that dump as soon as I get access to the TV again.

I was able to download the Firmware from depositfiles.

[eCroFeox]

hey hey,

I've dumped all the files from the TV and uploaded it to dropbox. I've sent the link per private message. If you need any more files or information..just feel free to ask

It's kind of important for us to use the 1008 firmware..so that we can install SamyGo afterwards. Maybe you have an idea to fix that little shutdown problem.

Thank you very much in advance..

[juusso]

For some unknown reason hashes of your 1008 firmware, stored on TV are wrong. I recalculated and edited values. Must be ok now:

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# ./chkhash -k 7CED26D8CA2FA0F80BC637E2FF07EC46 -L 0x0 2 hashes_chl6cipdseuc1008.bin *
hash[ 0] = a40997e609bfe39268f3db1b89f96693   length = 54972416  :  bml10.dmp
hash[ 1] = aa3b421c0b00ed548d1d971c42482f1c   length = 30867456  :  bml11.dmp

Extract from archive before to use

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cp /dtv/usb/sda1/hashes_chl6cipdseuc1008.bin /mtd_swu/
bml.restore /dev/bml0/19 /mtd_swu/hashes_chl6cipdseuc1008.bin

if no errors, then:

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echo SWU_T-CHL6CIPDSEUC_001008_I03_ES000DS000TS000_091112 > /mtd_rwarea/Version.1
touch /mtd_rwarea/PartitionSwitch_1_0
rm -f /mtd_rwarea/PartitionSwitch_0_0
sync
sync
/mtd_boot/MicomCtrl 143

After restart your TV boots to T-CHL6CIPDSEUC-1008.0. I see this is original untouched firmware, if you need autostart of SamyGO apps, you have to patch firmware and install to TV.

[eCroFeox]

hey hey,

hard to believe but it seems to work finally! Thank you so much

I don't really understood what you've done though Maybe...if you have time and you are in the mood..i would be thankful if you could explain what you did.. and how you recalculated the hashes...how you find out that the hashes are wrong and stuff like that because there's also an LE32B679 here that wants to get that old firmware too. I guess those hashes are especially for the LE40 that stands around here?

Thank you very much

kind regards

[juusso]

Actully whole work was done months ago. If you need to know what hashes are and how to calculate, check this thread.

I will add T-CHL6CIPDSEUC to FFB CI+ version, you just confirmed it must work on B679.

[eCroFeox]

alright...thanks... TV works stable for almost 30 minutes now...