This is a technical support thread for all types of inquiries for the N5ii. Latest update (3.3 EN) http://en.cayin.cn/download/show?id=13546 Known bugs/issues and fixes 1. Random freezing - solved on V3.3en 2. Blurry album art - clear cache 3. Colour inversion - try switching the display off and on. If not, reboot. Clear cache as last resort. No double wipe needed. 4. Slow-responding playback buttons - Usually happens after Bluetooth usage. Switching on and off Bluetooth MAY solve it. If not, clear cache. 5. No sound after playback - Try reinserting the earphones, play another track, reboot if still no sound 6. Noise in DAC mode - firmware fix in progress, using a shorter cable reduces noise. 7. Problematic Bluetooth connection - remove as many sources of interference in the surrounding area. (Turning off phone Bluetooth and WiFi) Clearing cache has solved all bugs for me(albeit temporarily), so far double wiping is unnecessary. Instructions : 1. Going into recovery mode - Power up or restart the device while holding the volume up button until the recovery menu appears. 1.1 Navigating in recovery mode - Next/previous button for up/down Power button to select 2. Device update - Download the update zip file, copy over the zip file into root folder of N5ii, go into recovery mode, select apply update from internal storage, find and select the update zip to start update procedure. The N5ii will reboot into recovery mode once the update is finished. Simply select reboot device now to go back to normal mode. 3. Clear cache - Go into recovery mode and select wipe cache partition 4. Double wipe - Go into recovery mode, wipe cache and select wipe data/factory reset General performance optimisation (works on every android device) - pull down the notification bar and go into settings, go to the very bottom of settings and select about device, tap kernel version until it says you have enabled developer mode, go back into settings and now you should see developer options above factory data reset, go into developer options and change 3 settings : window animation scale, transition animation scale, and animator duration scale, change all 3 from 1x to off, now you're good to go !!!