# Impossible to synchronize **URL:** \ **Category:** Syncing & AnkiWeb\ **Created:** [December 2, 2021, 9:21pm UTC](https://forums.ankiweb.net/t/impossible-to-synchronize/15527 "2021-12-02T21:21:47Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![So.xice](https://avatars.discourse-cdn.com/v4/letter/s/0ea827/32.png) [@So.xice](https://forums.ankiweb.net/u/So.xice)\ **Post date:** [December 2, 2021, 9:21pm UTC](https://forums.ankiweb.net/t/impossible-to-synchronize/15527/1 "2021-12-02T21:21:47Z")
Hi! Both my Anki desktop and the mobile version told me the deck collection is too different to be merged. So, I chose the collection, which I wanted to keep and assumed there would be no longer problem with the syncing. However, this message welcomes me every time I open the Ankidroid or click on the sync button on Anki in my pc. I chose one of the collections to keep and the other to delete, yet the problem is not solved. Any idea what I can do? ---
**Author:** ![dae](https://sea2.discourse-cdn.com/flex002/user_avatar/forums.ankiweb.net/dae/32/65_2.png) [@dae](https://forums.ankiweb.net/u/dae)\ **Post date:** [December 3, 2021, 6:28am UTC](https://forums.ankiweb.net/t/impossible-to-synchronize/15527/2 "2021-12-03T06:28:09Z")
To get things back to normal, you must choose Upload on one device, then Download on your other devices. ---
**Author:** ![So.xice](https://avatars.discourse-cdn.com/v4/letter/s/0ea827/32.png) [@So.xice](https://forums.ankiweb.net/u/So.xice)\ **Post date:** [December 17, 2021, 4:08pm UTC](https://forums.ankiweb.net/t/impossible-to-synchronize/15527/3 "2021-12-17T16:08:19Z")
Thank you very much, it helped. ---
**Author:** ![system](https://us1.discourse-cdn.com/flex002/uploads/anki2/original/1X/8f1279ababc5879d54e4838989f606cfe55af8c7.jpeg) [@system](https://forums.ankiweb.net/u/system)\ **Post date:** [May 1, 2023, 6:14am UTC](https://forums.ankiweb.net/t/impossible-to-synchronize/15527/4 "2023-05-01T06:14:29Z")
Closed on May 1, 2023, 6:14am UTC