Use mt manager clone for converting xapk to apk
Steps to convert:
1. Open mt manager clone and after that go to location where your xapk is there.
2. Tap on xapk you want to convert to apk and click ok.
3. When it converted to apk tap again on converted apk and click on view.
4. Open AndroidManifest.xml file and click on decomplie.
5. Now click on search button and search splitRequired and you will get requiredSplit Types="base_abi"
split Types=""
6. Remove requiredSplit Types="base_abi"
split Types="" and click save and go back.
7. After that click on auto sign and click ok.
And now are done with converting xapk to apk
I hope it helps you