How to downgrade my Lumia 510 WP 7.8 to WP 7.5?

How to restore lumia 510 7.5 rom from 7.8
Moderator's note: We have edited your post.  A more appropriate subject was provided so that other users can easily help you.

raghuramsarathy wrote:
hello, i recently updated my nokia lumia 610 via seven eighter update tool but i selected only the english language(us) instead of selecting all the languages.now my phone is updated to wp 7.8 but its showing the os as wp 7.5 .the problems im facing are i cannot increase the volume more than 17/30, im not able to use lock + wallpaper option in my phone.is there any ways to downgrade my os and fix this problem??
Sound like you only partially updated. That aside by your own admission you used an unofficial way of updatingthe phone which basically means you invalidated your warranty and it might also prevent your phone from receiving the remaining updates.
Click on the blue Star Icon below if my advice has helped you or press the 'Accept As Solution' link if I solved your problem..

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