Hello everybody so that i dont think that was all asked in the other Threads so i make a new one

I have several questions to flash at a Nexus. 5
The background:
I have the Nexus 5 sold with a dual boot CM12 and SailfishOS 2.0.1.11 on ebay.
The buyer will love this phone but there are problems with the touch screen.
After a short time freezes this.
The mobile phone is then not to be used for some time (seconds or even 1 minute).
Sometimes that helps press the Power button.

Since the buyer is very nice and of flash has no idea, I offered him to flash a usable version.

I now need your suggestions and help:

The buyer for some time already used ever Jolla. 1

For determine applications he uses apps from the Android range:
Yandex and Aptoide and F-Droid.

A killer feature would be a functioning navigation app with driving instructions. (Language!)

After a telephone conversation with him would be the best variant a Sailfish and Sfdroid or perhaps a dual boot.

My questions :

My variant initially selected: CM 11 on Sailfish 1.1.9.28 via OTA update to 2.0.0.10. This variant seems to run very stable.

well 1. An update on 2.0.1.7 or 2.0.1.11 is, however, I have found the then e.g. the camera does not work properly?

2. GPS under SFDROID not working?

3. Thus, it would be pointless to install HERE Maps or?

4. Is there under SailfishOS a functioning navigation with driving instructions?

5. I have read it from what Modrana but not tested?

For possibly neuflashen an installation of CM 12.1 and SailfishOS and Sfdroid to me also question left is:

1. Are there in the latest version see also this thread still problem with the touch screen? (See the beginning of my threads)

In case of possible dual boot I need then again help.
I had already made it in to a different Nexus but I do not remember exactly how.

Such a step by step guide would be great.

So something like:

1. Cell formatting.

and then
and then u.s.w

THANK YOU VERY MUCH

p.s. Sorry for my bad english !!