Jetson nano 4gb is not booting suddenly

Hello Nvidia Team,
I am using Jetson Nano 4GB Development board for a while.
Suddenly now it not booting. I checked by connecting to UART and messages is shown as below and continuously rebooting.


[0000.157] [L4T TegraBoot] (version 00.00.2018.01-l4t-8728f3cb)
[0000.162] Processing in cold boot mode Bootloader 2
[0000.167] A02 Bootrom Patch rev = 1023
[0000.171] Power-up reason: software reset
[0000.174] No Battery Present
[0000.177] pmic max77620 reset reason
[0000.180] pmic max77620 NVERC : 0x0
[0000.184] RamCode = 0
[0000.186] Platform has DDR4 type RAM
[0000.189] max77620 disabling SD1 Remote Sense
[0000.193] Setting DDR voltage to 1125mv
[0000.197] Serial Number of Pmic Max77663: 0x729f9
[0000.205] Entering ramdump check
[0000.208] Get RamDumpCarveOut = 0x0
[0000.211] RamDumpCarveOut=0x0, RamDumperFlag=0xe59ff3f8
[0000.216] Last reboot was clean, booting normally!
[0000.221] Sdram initialization is successful
[0000.225] SecureOs Carveout Base=0x00000000ff800000 Size=0x00800000
[0000.231] Lp0 Carveout Base=0x00000000ff780000 Size=0x00001000
[0000.237] BpmpFw Carveout Base=0x00000000ff700000 Size=0x00080000
[0000.243] GSC1 Carveout Base=0x00000000ff600000 Size=0x00100000
[0000.249] GSC2 Carveout Base=0x00000000ff500000 Size=0x00100000
[0000.255] GSC4 Carveout Base=0x00000000ff400000 Size=0x00100000
[0000.260] GSC5 Carveout Base=0x00000000ff300000 Size=0x00100000
[0000.266] GSC3 Carveout Base=0x000000017f300000 Size=0x00d00000
[0000.282] RamDump Carveout Base=0x00000000ff280000 Size=0x00080000
[0000.288] Platform-DebugCarveout: 0
[0000.292] Nck Carveout Base=0x00000000ff080000 Size=0x00200000
[0000.297] Non secure mode, and RB not enabled.
[0000.302] BoardID = 3448, SKU = 0x0
[0000.305] QSPI-ONLY: SkipQspiOnlyFlag = 0
[0000.309] Nano-SD: checking PT table on QSPI …
[0000.313] NvTbootFailControlDoFailover: Doing failover: NvTboot partition 6 is corrupted (ec=0x14).
[0000.322] NvTbootFailControlDoClobber:
[0000.325] Current BFS=0
[0000.328] No write function to write to current BFS 0
[0000.332] Clobber: returns e=0x1
[0000.335] - failover failed; Continuing with bad image …
[0000.341] Read PT from (2:0)
[0000.371] PT crc32 and magic check passed.
[0000.375] Using BFS PT to query partitions
[0000.381] Loading Tboot-CPU binary
[0000.409] Verifying TBC in OdmNonSecureSBK mode
[0000.419] Bootloader load address is 0xa0000000, entry address is 0xa0000258
[0000.426] Bootloader downloaded successfully.
[0000.430] Downloaded Tboot-CPU binary to 0xa0000258
[0000.435] MAX77620_GPIO5 configured
[0000.439] CPU power rail is up
[0000.441] CPU clock enabled
[0000.445] Performing RAM repair
[0000.448] Updating A64 Warmreset Address to 0xa00002e9
[0000.453] BoardID = 3448, SKU = 0x0
[0000.457] QSPI-ONLY: SkipQspiOnlyFlag = 0
[0000.460] Nano-SD: checking PT table on QSPI …
[0000.465] NvTbootFailControlDoFailover: Doing failover: NvTboot partition 6 is corrupted (ec=0x14).
[0000.473] NvTbootFailControlDoClobber:
[0000.477] Current BFS=0
[0000.479] No write function to write to current BFS 0
[0000.484] Clobber: returns e=0x1
[0000.487] - failover failed; Continuing with bad image …
[0000.492] Loading NvTbootBootloaderDTB
[0000.559] Verifying NvTbootBootloaderDTB in OdmNonSecureSBK mode
[0000.630] Bootloader DTB Load Address: 0x83000000
[0000.635] BoardID = 3448, SKU = 0x0
[0000.638] QSPI-ONLY: SkipQspiOnlyFlag = 0
[0000.642] Nano-SD: checking PT table on QSPI …
[0000.646] NvTbootFailControlDoFailover: Doing failover: NvTboot partition 6 is corrupted (ec=0x14).
[0000.655] NvTbootFailControlDoClobber:
[0000.658] Current BFS=0
[0000.661] No write function to write to current BFS 0
[0000.666] Clobber: returns e=0x1
[0000.669] - failover failed; Continuing with bad image …
[0000.674] Loading NvTbootKernelDTB
[0000.740] NvTbootKernelDTB is not valid
[0000.744] NvTbootKernelDTB partition is corrupted!
[0000.748] *** Set to failover in the next boot ***
[0000.753] NvTbootFailControlSetClobber:
[0000.756] *** Rebooting ***
[0000.157] [L4T TegraBoot] (version 00.00.2018.01-l4t-8728f3cb)
[0000.162] Processing in cold boot mode Bootloader 2
[0000.167] A02 Bootrom Patch rev = 1023
[0000.171] Power-up reason: software reset
[0000.174] No Battery Present
[0000.177] pmic max77620 reset reason
[0000.180] pmic max77620 NVERC : 0x0
[0000.184] RamCode = 0
[0000.186] Platform has DDR4 type RAM
[0000.189] max77620 disabling SD1 Remote Sense


I cross checked with power supply and it is fine and working.
I did original jetpak image flashed in to sdcard and it is showing same messages and not booting.
Please suggest some solution to overcome the problem.

Have you made any changes to device tree? If not, then likely you will need to reflash the unit (NvTboot is a very early stage in boot, long before Linux is ever reached). If you have an SD card for rootfs you could save a copy of that. Note that where some of this content is found differs between QSPI memory and the SD card depending on release. I can’t say much more which is useful, but if you do need more help, then knowing the release used on this unit and any flash history would help whoever answers.

I reflash the unit by flash.sh and it is working now.
Thanks for the support,

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