question regarding 5.1 update on xt1033 (rooted, BL unlocked)

hello XDA.
I have a first gen motoG (xt 1033, india) and I'm on stock 5.0.1 ROM

BootLoader is unlocked and the device is rooted.
I was having trouble updating to 5.1 from the OTA update as after the download the device was getting crashed at the reboot, with the update error.

if i donwload the update file (Retail Asia 5.1 Stock ROM (Optimized) v1.0 (337mb) by lost 101 and istall from recovery:

1. would it clear all my data nd installed apps as opposed to the OTA in which existing apps and data is preserved?

2. would i have to root again?

Some questions/issues regarding dualSIM feature

Hey folks,
i have some questions about the dualSIM feature, maybe you guys have an idea...

- is there a widget for switching on and off the SIM card(s)?
- is there an app like "Llama location profiles" that can handle dual SIM? I used Llama with the OPO and it worked like a charm, but apparently it won't work with the OPT (or in general with dualSIM?). I like to switch WiFi automatically on and off, depending on my location.
- Have anybody intellig3G (xposed) working with OPT? i used it as well with OPO, but with OPT it wont switch the networkmode

Oh one more, but not dualsim related:
is there an app to configure the notification slider on the side?


Thanks!

[HELP NEEDED] It's regarding Samsung Galaxy S III GT-I9300

I've used many stable as well as unstable ROMs for my samsung galaxy S III GT-I9300 but, none actually worked smooth including cyanogen ROMs. I never used to flash custom kernels. All the ROMs I've used are laggy. Presently using 12-20150401-UNOFFICIAL-i9300 lollipop 5.0.2 based ROM and it's been worst experience ever. All I'm expecting from my device is smooth ROM with no lags. So, please do suggest me some fantastic ROMs (lollipop based) and also some custom kernels which makes my device smoother. Nothing else I expect from my device. I don't play heavy games too.

[Q] What's the difference between the XT1575 and XT1572 regarding system image?

I live in Germany and will soon receive my style, maybe tomorrow. My question:

There are several issues, that points to different system images of the XT1572 and XT1575. I assumed, that for example the lte channels (= modem) are the only difference, but there are some others, too. In an other thread, an user described a problem with using WiFi correctly, after flashing the system image of the XT1575 on a XT1572.

This would result in different roms, if development will start soon. Is this correct? Does anybody know, what's the real difference of the two devices regarding software/hardware? Are there different WiFi modules? Can you please support me?

I'll wait with rooting my device until I'll get some clearance about this (and maybe until M via OTA arrives).