Because framaroot exploit security holes present in several devices which has been patched with update you have done, so exploits can’t root your device anymore. Framaroot’s exploits have a very short life to keep your device “less exposed” to others malicious application. Keep in mind that framaroot is not a permanent rooting application.

An advice : if you want to have a chance to keep root after update, don’t update with Kies or ODIN for samsung devices or don’t flash system partition, prefer OTA update and use OTA survival feature in Superuser or SuperSU. And if you have no choice, you can use the traditional method : flash tools specific to your device

Yes, but don’t ask when since I don’t know myself, it depend of the vendors fix response.

Often the first time you launch Framaroot by selecting Gandalf as exploit, it crash Framaroot. Don’t worry, in this case you have to re-launch Framaroot and select Gandalf again, the second time it should work.

All errors less or equal to 9 mean your device is not vulnerable. If you get error#10, give a try with Framaroot 1.5.3. All other errors need some investigation about your kernel image.

Maybe there is some additional protection on your device or something goes wrong with SuperSU version embedded in Framaroot. In this case, I recommend to use “Execute script” action and put your own shell script commands in /sdcard/custom (use at your own risk, all commands are executed with root privileges). Look at this post to know how to use custom script.

You see this message when the /system partition on your device is a read-only filesystem (eg: SquashFS). To handle this case Framaroot try to use a trick by adding “ro.kernel.qemu=1” in file /data/local.prop. To test if this trick work you have to reboot your device and connect to it with adb shell. Once connected type the “id” command to see if you are root. If you are not root, your last chance is to select “Execute script” action and put your own shell script commands in /sdcard/custom (use at your own risk, all commands are executed with root privileges). Look at this post to know how to use custom script.