[Q] Lollipop 5.1.1 backup for A510M - Galaxy A3, A5, A7, A8, A9 Q&A, Help & Troubleshoot

hey guys, does anyone have a twrp backup of lollipop 5.1.1 for SM-A510M.? I'm on marshmallow and battery used to be much better on lollipop. Already downgrade with odin but unfortunely got a fail error. Thanks

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Hi everyone,
I recently installed the CHN 5.0.1 lollipop on my S4(I9500).
I want to downgrade it to 4.4.2 kitkat official and upgrade it official 5.0.1.
i am not able to downgrade from lollipop to kitkat.
i downloaded my country stock firmware I9500DDUEMJ5 from sammobile and tried downgrading it using odin but every time it fails and i have to reinstall the same Chinese version lollipop all over again.
please some one help me with this problem.
Please tell me the proper steps to downgrade.
current bulid no :LRX22C.I9500ZCUJOA3
Device status : custom
thank you in advance
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