Default [Q] [Help] MIUI jelly bean 2.12.7 Themes

Hello all.
This is my problem.
I have a Samsung Galaxy S1 (GT I9000), wit a ROM MIUI jelly bean 2.12.7.
I see in a few posts, people ask for help, because can't install anymore themes from unofficial fonts or from SD card.
Seems the problem is because XIOMI change the policies, and just the Themes official and certified from they are work.
I see a post, from someone pass this problems, wit the Xposed and MIUI Tools. I test MIUI V5 ROM, and works, but in my phone this ROM is a bit heavy, so I downgrade for the jelly bean 2.12.7 again.
Now, can someone help me in this field, because, I try many times the same solution in V5 ROM, and seems don't work, he says the message the theme is not official.
Regards and sory my some bad word's in English.