[Android Head-Units] gpmg762:
Since there are threads for Joying, Teyes, FunRover and etc, I think there should be one for Junsun as well.

I bought a Junsun V1 4G+64G "Android 9.0" (Android 8.1) DSP Car Radio Multimedia Player For Suzuki Swift Sport 2010 to replaced my aged AN-21U [url]https://xdaforums.com/showthread.php?t=2528349[/URL] but I am quite disappointed with the sound quality, especially the radio tuner sound and reception.

The Intel eight cores performance is great compared to the old 2 cores and 64 GB storage is plentiful but the sound isn't even close to the AN-21U even though it has DSP.

The radio tuner sounds mono when it indicates stereo, switching to mono sounds exactly the same. Auto scan comes out with zero stations. I will try to get a FM signal amplifier to see if it helps.

The RCA cable did not have an input for external mic. I asked the seller and he said there has been a upgrade with the sensitivity of the internal mic and this version don't support external mic. The internal mic has work satisfactory so far for voice commands and calls.

I used TuneIn radio to replace the lousy FM tuner but it was only marginally better. I replaced it with Poweramp internet radio streams and I have a winner. Unfortunately, Poweramp doesn't support Google music.

For that, you will need USB audio player pro. It sounds better than Youtube music and also support Tidal, Qobuz, Shoutcast, DLNA server and internet radio streams.

My Setup

4x focal speakers front and back. RCA out to DLS Ultimate A3 in the front and an active BLAUPUNKT active subwoofer through the subwoofer output in the rear.

Factory menu / Developer options: 3368

Firmware

Given by my seller on 11th of July 2020 and dated 12th of December 2019. https://www.dropbox.com/s/42ljf73g4j51ctu/K989B T01UI-P820版191212（删语音助手）.zip?spm=a2g0s.imconversation.0.0.2b403e5fbvEIPX&dl=0

From 4pda for 2/32GB 4G version and dated 12th December 2019. https://yadi.sk/d/g-ThBQ67kdPsng

From seller dated 20200409, courtesy of @Aces37. https://www.mediafire.com/file/u0scd7h9qzlgabs/K924D固件junsun+v1+pro.zip/file

From 4pda dated 20200409, https://www.dropbox.com/s/es3h3k4vmuyx4yt/K989D软件.zip?dl=0

***Please use the firmware at your own risk, I am not responsible if it bricks your unit.

Rooting

Tried out the rooting method post at https://xdaforums.com/showpost.php?p=82485735&postcount=228 and it will indeed cause problem with voice navigation for Google Maps, Waze and Google Assistant. Sygic was ok, perhaps it doesn't required Google TTS. Someone complains problem with PlayStore too but I didn't test it and un-rooted by restoring the original boot image.

***Root at your own risk, I am not responsible if it bricks your unit.

Recommended Apps

Car Launcher https://play.google.com/store/apps/details?id=com.autolauncher.motorcar.free&hl=en_US&gl=US

AGAMA Car Launcherhttps://play.google.com/store/apps/details?id=altergames.carlauncher&hl=en_US&gl=US

Fcc Car Launcherhttps://play.google.com/store/apps/details?id=ru.speedfire.flycontrolcenter&hl=en_US&gl=US

Poweramp. https://play.google.com/store/apps/details?id=com.maxmpz.audioplayer&hl=en-GB

Torque. https://play.google.com/store/apps/details?id=org.prowl.torquefree&hl=en-GB Instruction to enable for zc31s in attached text file.

USB Audio Player PRO. https://play.google.com/store/apps/details?id=com.extreamsd.usbaudioplayerpro&hl=en-GB

Smart App Manager, Blockada, Here WeGo. https://xdaforums.com/showpost.php?p=83106787&postcount=16

Useful links

4pda. https://4pda.ru/forum/index.php?showtopic=938749

Modding your Joying/FYT SC9853i unit without root https://xdaforums.com/showpost.php?p=82485735&postcount=228

Search your internet radio streams here. http://www.radio-browser.info/

Accessories

RCA with mic input, https://item.taobao.com/item.htm?spm=a1z09.2.0.0.19512e8dGkbVjg&id=594681383408&_u=61ldttqd2383

Matte tempered glass screen protector, https://detail.tmall.com/item.htm?i...1ldttqdacaf&sku_properties=228680323:25890744