This Links are directly from Lava OR Google,
That is, the Update which you Download in "System updates",
Which is at "Settings=>About phone=>System updates".
I have Only Provided you the LINK'S to Stock OTA & Security Patch Update ZIP's.
And I do not Have any Rights or Control over those ZIP's.
Hence I have NO way to EDIT those ZIP's, & Therefore are provided AS IS.
These ZIP's can be Flashed using Stock Recovery OR TWRP (Custom Recovery).
 IF using Stock Recovery,
Then you need to make sure that current update is done over previous update,
Else Stock Recovery will give ERROR & will NOT update.
NOTE:You Need to have Inserted External Micro SD Card, & all the Update ZIP's ON it.
 IF using TWRP ,(Link)
Then you need to edit the ZIP file in "updater-script",
By removing all "getprop", "file_getprop" & "apply_patch_check" Lines,
Else will get an ERROR & will NOT update.
Note To ALL:
I (Dark❶) is NOT & will NOT be Responsible for any USE of ZIP's which are provided in this Thread, IT is Your responsibility & what you DO with it.
If you flash those ZIP's & any S**T happens to your Phone, Then I (Dark❶) & Anyone else is NOT Responsible, BUT you are.