To save your account, you can go to the "Data Transfer Settings" from the Gear icon when you are in-game, then choose "Data Transfer with KONAMI ID". Register a new account if you don't have it yet and bind it to the account.
June 7th update
Recently, there were problems associated with making a KONAMI ID, which has now been fixed, but a new method to save your account is now added as well. You can now set up a data transfer to back up your account using Google Play Games. Simply log in to your Google Play account when you are in-game, and choose "Data Transfer Setup (Google Play Games)" in the Data Transfer Settings.
Setting up a data transfer
1. Tap a gear-shaped icon
2. Tap "Data Transfer Settings"
3. KONAMI ID or Google Play Games
You can link your game data to both a KONAMI ID, or Google Play Games. In case one of them isn't available, you can use the other to restore your data. You can link your game data to a different KONAMI ID, or Google Play Games if you accidentally used a different or wrong account, but it will replace the previous one. If you plan on transferring from using Google Play services to iTunes, make sure you use KONAMI ID instead.
3.5 KONAMI ID
If you are using KONAMI ID, login or generate first before linking your game data to it.
If you did everything correctly, your account is now saved so you don't have to worry about losing it if your phone is broken, a data error or if you uninstall the game. You will have to re-download all of the data files though.
Using your account on a different device
When you want to use your account on a different device, you will need to log in to your account. When you first launch the game, before you tap "INITIATE LINK!", tap the button below for "Data Transfer" and log into your account.
If you set up using a KONAMI ID, simply log in to your registered account that you linked your game data to. If you are using Google Play Services, make sure you are logged in to the right account.
If you lost your account before you managed set up a data transfer, you can try recovering it from the "Contact Us" and "Submit Player Data Recovery Inquiry" from the gear icon in-game.
1. Tap a gear-shaped icon
2. Tap "Contact Us"
3. Read through the description & Tap the button
4. Submit inquiry
You will need to provide your information as accurately as possible for them to be able to identify that it is yours. Simply giving them your player ID is not enough, since anyone can look that up and is not a very reliable information. Try to remember stuff like deck names, latest card obtained of certain rarity or what device you used it on.
Next step is to wait patiently and check your email for a reply from their support team.
I've send them my whole history of purchases I've bought an even the last date I played my old account an even gave them my Correct ID from the old account to even telling them my lvl of mission which it was at 55 an rank gold on pvp battles an even the last character I was playin with an they are havin a hard time finding or helping recover my old account it's been 3weeks since I've playedthegame
An this is ridiculous how they still cant help me out ..ugh an my previous save game on konami got overwritten with my new ID account that it doesn't help at our all..I've complete I'm out off options..
I have transferred and backed up my data on the Steam. Probably a dumb question, but is it now safe to delete the app on my phone? I'm so sick of those little notifications popping up at night and saying "It's time to duel!" and stuff like that!
My notifications have been having problems when it comes to anything with the duel links app. Can I just delete the app without it hurting the Steam game data? I don't play on my phone anymore.
Babyboi713 10days ago
I'm so frustrated with them an konami because they keep on having me. Back an forth with questions that I've answer an screenshots I've send them with items I have bought an enough information to recover my old account I was on mission 55 rank gold on pvp battles have over 900hrs of playin since 2017..they really need to help the ppl that have spend money on this game to recover their old account..
Stupid konami overwrite my account with the a new one an erase my old account ..how to recover it from konami .?because if I transfer my konami account to new device it sends me the new account an not the old one I have save.
Ok, so I got a question! I did a data transfer on my phone to protect my data from bein' erased. I have switched to Steam now and got all of my old duel links data from my data by data transferring it over from the title screen. Do I have to do the data transfer in settings again to make sure it is secure on the Steam version, or is everything just saved permanently now from last time?
I did it on the Steam just to be safe. It said the data transfer got completed so all's well and good now!
Anonymous 10days ago
I downloaded duel links on my phone last year, and uninstalled it after get bored. Now i installed it again because want to played it again on the same phone. But i didnt use the data transfer on my previous save. When I open the game, i start over from stage 1. Can i recover my previous save eventough i didnt use the data transfer and play in the same phone? Sorry for my bad english.