xDuoo X3II SinuX Edition firmware

Features

English and Russian languages improvements
Brand new UI design
UI speed-up
Changeable UI themes (12 built in + unlimited amount can be loaded from SD card)
Battery levels fixed
Brightness levels fixed
All five DAC digital filters implemented (Sharp/Slow/Short Delay/Short Delay Slow/Super Slow Roll-off)
EQ adjust range extended to ±9dB
DSD noise fixed
Track count limit increased from 15k to 65k
SBC XQ feature implemented (see this article)
Two-way AAC (Tx: AAC-LC, CBR 256kbps, 20kHz bandwidth; Rx: controlled by source)
Two-way LDAC (Tx: LDAC HQ 909/990kbps, Rx: controlled by source)
LCD color gamma fixed
Native sampling rate support up to 384kHz

Installation guide

Just place update.upt file on the root of SD card and launch Firmware update in system settings. If you want a larger font, use the bigger_font_update.upt file (don't forget to rename it to update.upt first). If you have any trouble with bluetooth connection - just disable LDAC & SBC XQ in bluetooth settings and restart your player.

Attention to Rockbox users: you must go back to the stock 1.2 firmware first!