[Android Q&A, Help & Troubleshooting] Tarasantan:
Good news for all the users of LYF F1 who want to have twrp and root access.

I found the stock rom at link "http://www.smartfirmwares.com/forum1/index.php?topic=189.0"

I extracted the stock rom and got the stock recovery,then I got the twrp recovery of ZTE Axon 7 Mini.

I ported the twrp by replacing only the zImage from the stock to the twrp,and kept the ramdisk the same in twrp.

It booted up well but I got a error that twrp could not mount any partition except the recovery.

I then got the twrp of Moto G4 Plus,but the twrp did not have the ramdisk,it only contains zImage,so I could not port it.

I then got the twrp of Samsung Galaxy C5 and ported it in the same way,but it put the phone into recovery bootloop,phone was booting into twrp,then switching off,then again booting to twrp,at one moment when phone was switched off for one second,I flashed again the previous working recovery.

I then ported the twrp recovery of ZTE Axon Max but it gave the same error that it could not mount any partition except the recovery.

Then I ported the twrp recovery of ZTE Nubia Z11 Mini and this one was successfull without any error,but the recovery was in chinese.I can not remember the whole thing but the first window appeared in front,I touched the lower right conrer and changed the language to english,since then everything is in english.The link of that recovery is "https://drive.google.com/open?id=0B2iZIwRNj3bpaEl3dWR1eXRsalk" and password is "Created-by-Tarasantan"

Now How did I flashed the twrp,I downloaded and extracted the stock rom,then I found a "_qcMUP.zip" within the zip "LYF F1 LS-5505 TOOL & DRIVERS.zip",then extracted the zip _qcMUP.zip,there in the support folder I found some windows softwares,I ran all of them to install the drivers and neccessary files.

Then in the "LYF F1 LS-5505 PC SW VER 01_06 By Gsm_F!rmwares_Tm" folder I replaced the stock "recovery.img" with the twrp "recovery.img".And then I ran the "qcMUP.exe" in the _qcMUP folder which I previously extracted.

Now I clicked the do button in the upper right corner of "qcMUP.exe",then clicked upgrade,then I selected the "LYF F1 LS-5505 PC SW VER 01_06 By Gsm_F!rmwares_Tm" folder.

Now I switched off the phone,then I pressed and hold volume up and down at the same time,and pluged the phone into the computer and the flashing started on qcMUP.exe window with a light blue bar filling up with a deep blue colour as the flashing was going on.

This will clear all the apps and data you previously have had in your internal memory.So you can back up all the installed app with es filexplorer,or super backup,and all the contacts and smses with super backup,then you must move all the backed up things and other neccessary things to the sd card.At the end put the latest supersu.zip in your sd card.

The next part is very important,when flashing is passed,you will unplug the phone from the computer,then press and hold the power and the volume up at the same time.You will be booted up into twrp then somehow change the language to english from chinese,then flash the supersu.zip from your sd card,if you do not boot into twrp and flash the supersu.zip then whenever you will boot into the system,the twrp recovery will be replaced with the stock recovery,when you flash the supersu.zip,it patches the boot.img so that it does not replace the twrp recovery with the stock.

Alternatively

you can use the following method.I have not tested this method,but this should work.In this method you just need to download this file "TWRP For LYF F1.7z",from https://drive.google.com/open?id=0B2iZIwRNj3bpanRsaUM0OEdYV3c ,password is Created-By-Tarasantan .This recovery is made for exactly LS-5505,that means ro.product.device is LS-5505 ,ro.product.locale is en-IN and other properties are also changed for LS-5505.

Download and Extract the "TWRP For LYF F1.7z" file,then install the given drivers,then run the "qcMUP.exe".

Now Click the do button in the upper right corner of "qcMUP.exe" window,then click upgrade,then select the "LYF F1 LS-5505 TWRP 3.0.2" folder.

Now switch off the phone,then press and hold volume up and down at the same time,and plug the phone into the computer and the flashing should start on qcMUP.exe window with a light blue bar filling up with a deep blue colour as the flashing is going on.

This will not clear any apps and data that you previously have had in your internal memory.So you do not need to back up anything.But you need to put a supersu.zip in your sd card.

The next part is very important,when flashing is passed,unplug the phone from the computer,then press and hold the power and the volume up at the same time.Your phone should be booted up into twrp,then flash the supersu.zip from your sd card,if you do not boot your phone into twrp and flash the supersu.zip then whenever you will boot into the system,the twrp recovery will be replaced with the stock recovery,when you flash the supersu.zip,it patches the boot.img so that the boot.img does not replace the twrp recovery with the stock one.