[Experimental] Install W10 on ANY phone running 8.1

Ok flashing with a hk 635 rom but will I be able to get back my original rom! India 520! In the tech preview itself
 
I got it on my 930 without flashing. I just updated it. The method was so simple. But language option is not working for me.
 
Mine worked perfectly fine after a hard reset. I messed up the install of Windows 10 the first time I tried. Hard reset then redid the steps to installing Windows 10. Worked after that and now I have Windows 10 running on my Nokia Lumia 928
 
Anyone tried on Lumia 535 dual sim ?
I recently bought lumia been in 520 for developer preview for year. and looking forward to install in lumia 535