[HELP!] UE55B7000 Bricked! - Boot Loop after SamyGO FW flash

[aquadran]

Someone need dump bootloaders from flash on ci+ device and look into dissassembly.

[erdem_ua]

Hey Guys,
I Really appreciate your help.
In the mean time I've called Samsung to report the problem. They'll call me back within 24 hours to make an appointment for a repairguy.

I Still hope we can solve this problem ourself. Can also be handy for the future.

Since we don't know problem yet, we cannot solve it. We need B7000 CI+ bootloader image for inspection for why not entering to bootloader.. Also other images required for identifying problem... But we don't have it.

Your TVs problem is only software problem, they needed to reinstall software program only. Replacing internal HW it not required to repair this. Anyway, services wanted to replace not working parts instead of repairing and this makes bills higher.

Sorry for your TV.

[dynamic1969]

Hi mestief,

actually "the only thing you need to do" is to:

Code: Select all

rm /mtd_rwarea/PartitionSwitch_0_0
touch /mtd_rwarea/PartitionSwitch_1_0

as this would force your TV to boot from its backup image which should normally still be 100% OK!
However,this is easier said then done ...

A couple questions:
- have you disabled the watchdog in your Services-Menu ( try doing so if not done yet ) ?
- does the TV stay on for a couple seconds or does it immediately reboot after it gets the error ?

I have no CI+ device myself and can therefore not tell, whether entering the bootloader on a CI+ is possible ( however, I remember to have seen that it was possible ). Check out following WIKI-Article for getting access via the bootloader.

Reflashing with dumps:
I would recommend to only alter /mtd_rwarea ( ideally with an image that has "PartitionSwitch_0_0" removed and "PartitionSwitch_1_0" set instead ), as this is an area where not too much harm can be caused. I could provide a dump of such a modified mtd_rwarea, if desired.

Regards
dynamic

[aquadran]

Hi mestief,

actually "the only thing you need to do" is to:

Code: Select all

rm /mtd_rwarea/PartitionSwitch_0_0
touch /mtd_rwarea/PartitionSwitch_1_0

as this would force your TV to boot from its backup image which should normally still be 100% OK!
However,this is easier said then done ...

A couple questions:
- have you disabled the watchdog in your Services-Menu ( try doing so if not done yet ) ?
- does the TV stay on for a couple seconds or does it immediately reboot after it gets the error ?

I have no CI+ device myself and can therefore not tell, whether entering the bootloader on a CI+ is possible ( however, I remember to have seen that it was possible ). Check out following WIKI-Article for getting access via the bootloader.

Reflashing with dumps:
I would recommend to only alter /mtd_rwarea ( ideally with an image that has "PartitionSwitch_0_0" removed and "PartitionSwitch_1_0" set instead ), as this is an area where not too much harm can be caused. I could provide a dump of such a modified mtd_rwarea, if desired.

Regards
dynamic

he doesn't have access to shell.
he can't disable watchdog as software reboot before access to service menu.