Electro help: JBL PARTY BOX 100 BU Connected Home-How to disassemble, software upgrade and Reset, Schematic diagram, short circuit and thermal protection

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Audio Amplifier Section
Set all additional processing (tone controls, equalizers, audio effects, etc) to native or bypass, Set Unit on Test mode, set digital generator either off if not additionally defined. Output resistive load = 4Ω, 2 channels loaded. All voltage measurements are made with RMS detector,1kHz signal,10Hz~22kHz
BW, unless otherwise specified.

Speaker Output(Aux-in and BT/USB)

Short circuit, overvoltage and thermal protection

Software upgrade and system Reset

Restore factory setting
1. Power on, Hold down<PLAY> and <VOLUME +>keys on the top panel about 10 seconds.
2. Then, the unit will power off, the reset successful.
3. After factory settings restored, the unit will reboot automatically.
Check software Version
1. Power on, the unit is nothing input（ No BT connection / No USB play / No AUX IN input.
2. Hold down <BASS BOOST> & <VOLUME - > keys on the top panel about 2 seconds.
3. The unit will voice playback software version.
4. The unit will exit the SW version speech mode automatically.
Software Upgrade via USB
1. Copy the firmware file (XXX.bin) into a USB flash drive.
2. Insert the USB flash drive to the set.
3. Hold down <VOLUME+> and < BT > keys on the top panel about 10 seconds. The right woofer LED will show red.
4. Starting to upgrade, The right woofer LED colour to white. White LED will display the upgrade progress.
5. Then, the unit will power off , the upgrade successful.
6. The unit will reboot automatically.