You can go to play store and read the software review, so far no user complain about mmc die, the developer say he is using for 3 years without any problem.

AOSP ROM. (Im using it right now)
http://en.miui.com/thread-39099-1-1.html
CM11 4.4 Kitkat ROM. (Havent tried it yet, but it seems it have serious bug that is no signal)
http://en.miui.com/thread-43050-1-1.html

No doubt both are also very good custom rom, hope it will become more stable from time to time. I feel MIUI is more user friendly, especially when someone call me while I am in game, my game will not force close and caller details will show on top of screen instead.

The 8 seconds sim choose option will ensure I wont make call with the wrong sim. I also like the sound option, it could assign different tones to Call , message, message receive, message delivery and Notification without rely on any software.

The problem for the ram and move apps to SD card could temporary solve by Foldermount and Ram Expander. Its just my personal opinion of course.

Just now tried Asphalt 8 without Ram Expander, it crash with normal video setting before race start. I try with Ram Expander now, I could run with High video setting + listening to Kuwo at the same time without crash 

not true
just tested add contact to sim card then delete
working perfect

Just press the system update and let it do the remaining job automatically

MIUI ROM 4.9.12 is the ROM version for MIUI 6 (not MIUI 5)

the one you circled in your posted with ver.4.3 is the Android version, which stands correct for current version. Mine Redmi 1s also v4.3

latest Redmi 1s MIUI version is MIUI-JHCMIBF37.0 (current latest stable)

I can add/delete no problem on my end. Maybe you can try changing your sim card first. If you can't, just use google/gmail to organize, once all contacts sync>use any app that can backup your contacts to your sdcard or whatever thing you want it to be offline, then delete all phone contacts from that google/gmail account.

goto contacts, select the contact then delete button

I don't know about yibaandre. What you pointed out here is contacts on the phone.
I used 'Configure Sim card' to delete, no issues.

Did you do a hardware test on the display? dialing *#*#64663#*#* , then goto no. 11

Sorry, I meant no. 12 . Just in case someone needs to do the same test here.

yes,

fyi my phone is set to display contacts from sim only
no contact in phone

Its miui v6 which is still buggy for the 1S. I think the Mi3 has it as stock but theres a downgrade procedure to miui v5 which tells you how much people like it.

Mmm i use this method to test my SIM and i get this -->


The "Pass" button grey out     

By the way how to setup screenshoot to save in sd card ?? Thanks first.