Actually I had this solution for months, but because of what you said in one of the post
Nevertheless, with my tests I’m able to go from aab to apk rebuild apk to aab, back and forth without a issue with only one keystore…
Going through Google you are using two keystore’s
FYI,
From August 2021 , the Google Play Console will require all new apps to:
- Publish with the Android App Bundle format.
- Utilize Play Asset Delivery or Play Feature Delivery to deliver assets or features that exceed download size of 150MB. Expansion files (OBBs) will no longer be supported for new apps.
- Target API level 30 (Android 11) or above and adjust for behavioral changes.
In your case as you want to update your apps
Requirements for updates to existing apps
From November 2021 , updates to existing apps will be required to target API level 30 or above and adjust for behavioral changes in Android 11. Existing apps that are not receiving updates are unaffected and can continue to be downloaded from the Play Store.
You have time until November
what exactly prevents you from building an apk file in SDK29 and update your existing project in Google Play?
Taifun
Hey Taifun,
Any idea what’s the api version upgrade time kodular takes on an average from Google Play Store deadline dates. You must have seen this in the past and you are the most experienced. Thought of asking you.
they always try to update asap
Taifun
Do we have to recreate the app for api level 30 which is already created for Target api 29?
please sdk update
well i founded the solution to change 29 to 30 api in aab should i post an guide ? i am lazy little bit 
great !!
why not ?
नेकी और पूछ पूछ
Of course, this would be nice.
well i will try to post the tutorial by today because it very long method to change the target api 29 to 30
Fine, but maybe you can tell us beforehand whether or not you had to decompile the AAB to do this.
Yes but not fully only android manifest from aab and currently i am having one issues with complied apk from aab i am looking to fix into that
edit: i have fixed that issues
this apk has build from aab and it has target 30 in androidmanifest.xml you can try this apk test.apk (5.1 MB)
i will post an guide with easy method it will take me time
thank you
Hi i need some help how can i contact u
Please tell us how to do. I along with lot of other developers will be thankful to you forever.
I have been waiting for this for a long time. Please guide as soon as possible. Thanks very much
well i posted an guide to change 29 to 30 but it show to me "your post needs approval " so wait for some hours it will be public when mod approve it
Extremely Helpful 
