Read JBL SB 250 (serv.man3) Service Manual online
Reset and Firmware Upgrade Procedure
How to Reset/Factory restore?
Step1: power on the set.
Step2: press and hold the “VOL-“ and “Surround” key on the
panel for over 3 seconds.
Step3:waiting for 2~3 seconds, the DUT will reboot automatic
and all the setting has being reset.
Step4: Power off.
How to upgrade the firmware?
Step1: copy the firmware file “JBLSBX50.HUI” to the root of
the USB disc. Please make sure the file system of the
USB disc is FAT32.
USB disc is FAT32.
Step2: power on the set.
Step3: insert the USB disc to the set.
Step4: press and hold the “VOL+“ and “Source” key on the
panel for over 3 seconds.
Step5:The white LED on “power” button of the panel will start
to flash, it indicates the system is in upgrade procedure,
please don’t remove the power supply.
please don’t remove the power supply.
Step6:Waiting for the POWER LED turn to constant amber, it
indicates the upgrade procedure is success,
It takes
around three minutes to the whole process.
Step7: Power off.
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