I have experience decompiling and recompiling apk's using apktool. We used this tool often at my previous job where we decompiled apk's and recompiled them to determine how they function.
It should be relatively straight forward unless the apk is a system app.
1. Use apktool to decompile the app
2. grep for the mac address
3. replace the mac address with whichever one you like
4. Use apktool to recompile the apk
5. Sign the apk with your own signer (you'll need to uninstall the apk on the device and reinstall it)
£18 GBP in 1 day
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5 freelancers are bidding on average £16 GBP for this job
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