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Troubleshooting
Tsunami
®
 800 & 8000 Series - Software Management Guide 
278
8.9.2 Bootloader Mode
S.No
Scenario
Recovery Procedure
1
a) The device operating 
image is corrupted for 
reasons such as power 
interruption while upgrading 
(For only 
MP-820-BSU-100;
MP-822-BSU-100;
MP-820-SUA-50
+
MP-820-SUA-100;
MP-822-SUA-100;
MP-825-BS3-100; 
MP-825-SUR-50
+
;             
MP-825-SUR-100;                  
devices).
After powering-up the device, press and hold the Reload button on the 
PoE injector (use a pin or the end of a paper clip) for first 15 seconds and 
then release the button between 15-30 seconds. By doing so, the 
operating image will get deleted.
No reload via Ethernet cross cable.
It is not applicable to MP-835-CPE-10, MP-835-CPE-25, 
MP-835-CPE-50, MP-835-CPE-100, MP-825-CPE-50 and 
MP-825-CPE-100, QB-835-EPR/LNK-25, QB-835-EPR/LNK-50 and 
QB-826-EPR/LNK-100 devices. 
After deleting the operating image, refer
 
 
and
 
sections to load the firmware onto the device.
For Reload procedure using ScanTool specific to MP-820 / 830 series devices, 
refe
b) The device operating 
image is corrupted for 
reasons such as power 
interruption while upgrading 
(For all devices).
Do one of the following:
While powering the device, press and hold the Reload button on the PoE 
injector (use a pin or the end of a paper clip) for 15 seconds. By doing so, 
the operating image will get deleted.
Use a 4-pair (Gigabit) cross over Ethernet cable between the PoE and the 
device. By doing so, the reload functionality gets activated and forcibly 
deletes the operating image.
If you are having serial access to the device during POST, press SHIFT+u to 
enter into forced user mode of the bootloader. From the Bootloader 
prompt, enter the command firmware_delete.
After deleting the operating image,
 
refer 
 sections to load the firmware onto the device.
2
The device is not accessible 
for reasons such as user has 
forgotten the web interface 
login password, 
Management VLAN Id is 
changed, and wrong VLAN 
configuration.
And, you do not have a 
reload capable PoE but Serial 
access is possible
If you are having serial access to the device during POST, press SHIFT+u to enter 
into forced user mode of the bootloader. From the Bootloader prompt, enter the 
command config_delete. This command will also delete the Upgrade License 
file. 
Next, issue the command reboot.
The device now reboots and comes with: IP Address169.254.128.132; 
Username
admin; and Passwordpublic