RBR50 failed boot

[alexnev]

Hi All,
I recently got a used RBR50 device and its in constant green light mode. Nothing helps anb its not changing to anything no matter how hard i tried (resets, tftp mode and etc.
I opened it up and connected serial console. Here is what im getting. AM i correct thinking that it is physical bad flash memory chip and there is nothing to be done here? Can you please take a look and advise? It stops in console and nothing happens.
Thank you in advance!

Format: Log Type - Time(microsec) - Message - Optional Info
Log Type: B - Since Boot(Power On Reset),  D - Delta,  S - Statistic
S - QC_IMAGE_VERSION_STRING=BOOT.BF.3.1.1-00110
S - IMAGE_VARIANT_STRING=DAAAANAZA
S - OEM_IMAGE_VERSION_STRING=CRM
S - Boot Config, 0x00000023
S - Reset status Config, 0x00000000
S - Core 0 Frequency, 0 MHz
B -       262 - PBL, Start
B -      1342 - bootable_media_detect_entry, Start
B -     65343 - bootable_media_detect_success, Start
B -     65357 - elf_loader_entry, Start
B -     67786 - auth_hash_seg_entry, Start
B -     69951 - auth_hash_seg_exit, Start
B -    105221 - elf_segs_hash_verify_entry, Start
B -    220274 - PBL, End
B -    220299 - SBL1, Start
B -    312478 - pm_device_init, Start
D -         9 - pm_device_init, Delta
B -    313993 - boot_flash_init, Start
D -     28053 - boot_flash_init, Delta
B -    346400 - boot_config_data_table_init, Start
D -      2961 - boot_config_data_table_init, Delta - (419 Bytes)
B -    354060 - clock_init, Start
D -      7540 - clock_init, Delta
B -    365479 - CDT version:2,Platform ID:8,Major ID:1,Minor ID:0,Subtype:1
B -    368885 - sbl1_ddr_set_params, Start
B -    373978 - cpr_init, Start
D -         2 - cpr_init, Delta
B -    378361 - Pre_DDR_clock_init, Start
D -         4 - Pre_DDR_clock_init, Delta
D -     13171 - sbl1_ddr_set_params, Delta
B -    391656 - pm_driver_init, Start
D -         2 - pm_driver_init, Delta
B -    462967 - sbl1_wait_for_ddr_training, Start
D -        27 - sbl1_wait_for_ddr_training, Delta
B -    479334 - Image Load, Start
D -     19591 - QSEE Image Loaded, Delta - (262104 Bytes)
B -    499352 - Image Load, Start
D -       899 - SEC Image Loaded, Delta - (0 Bytes)
B -    509202 - Image Load, Start
D -     12424 - APPSBL Image Loaded, Delta - (416039 Bytes)
B -    522052 - QSEE Execution, Start
D -        60 - QSEE Execution, Delta
B -    528232 - SBL1, End
D -    310045 - SBL1, Delta
S - Flash Throughput, 21924 KB/s  (678738 Bytes,  30958 us)
S - DDR Frequency, 672 MHz


U-Boot 2012.07 [Barrier Breaker unknown,unknown] (Jan 04 2017 - 13:54:09)

U-boot dni1 V1.4 for DNI HW ID: 29765352; NOR flash 32MB; EMMC flash 4000MB; RAM                                                                                                                      512MB
smem ram ptable found: ver: 1 len: 3
DRAM:  512 MiB
machid : 0x8010001
NAND:  ID = 0
Vendor = 0
Device = 0
Nand Flash error. Status = 64
ONFI Read id cmd failed
ONFI probe failed
SF NAND unsupported id:ff:ff:ff:ffSF: Unsupported manufacturer ff
ipq_spi: SPI Flash not found (bus/cs/speed/mode) = (0/0/48000000/0)
0 MiB
MMC:   qca_mmc: 0
*** Warning - bad CRC, using default environment

PCI0 Link Intialized
In:    serial
Out:   serial
Err:   serial
Valid chip addresses:

 

[L&LD]

Hope you can get your money back.

 

[alexnev]

Nah, it was advertised honestly and cheap. External plastic housing is perfect and power supply is good - so at least those parts are salvageable.

 

[deslos]

Nah, it was advertised honestly and cheap. External plastic housing is perfect and power supply is good - so at least those parts are salvageable.

Hello!
Did you find any solution? I've read all posts I found here and at netgear forum, in most of the cases the device reaches the 'Hit any key to stop autoboot' , in my case (and as I see yours) the boot sequence stops earlier! [Funny enough, in my case, in few tries I get 4 extra lines of log, but never reaches a state that I can provide input/commands]
Are there any ideas/solutions/thoughts/hints ... ?

 

[alexnev]

Unfortunately in my case looks like dead flash chip and nothing short of replacing it will help.

 

[Thomasx]

Hi

I have an RBS50 that seems not to boot as expected, and it is not possible to download new firmware in any way. I tried both nmrpflash and tftp and nothing seems to work.

This was really good info about the serial console. Didn't know there was one. FINALLY I am getting somewhere.

EDIT: I started my own thread now, with the help of the info about the serial console here.

 

[Thomasx]

BTW, did anyone ever manage to fix this NAND flash error issue? If so, how? I have the same issue.

 

[Thomasx]

Finally I managed to fix mine. Here's what I did

YES! YES! YES! EUREKA! RBS50 Unbricked! :-)

I MANAGED TO UNBRICK MY RBS50! :D:D:D Here's a short description of how I did. I turned of Wifi on my PC. (Important to avoid any network issues) I connected to the RBS50 with the serial console. I also connected the RBS50 to my PC with an ethernet cable, connected to the LAN port closest to...

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