As all the Vivo Y21L users know 1.17.1 is the current latest update available for our devices but even though its 2018 we haven't received a system upgrade on this device from its launch. This was and is a great problem for all users however we all might be waiting for the update but when i contacted the vivo customer care their answer was this:

Dear User(Name),
Thanks for your email and we are deeply sorry for the delay getting back to you.
We totally understand your feelings and we'd love to help you with your issue. However, considering the limited HR resource and the stability of the system, there is no plan to update your phone to a higher Android version. Hope you can understand it.
If you have any other questions we could help with, please feel free to let us know.

Best wishes
Lee
Vivo Support Team

According to their reply it is clearly stated that there is a lack of HR resources but can vivo just take a second to answer whether is it the users responsibility or the company's responsibility to appoint new skilled HR. It is also mentioned that the system is not stable which is an absolute false statement there are many devices with the snapdragon 410 processor (Which Y21L and Y51L uses) that run higher android versions without any stability issues. All the vivo devices available/shown on Vivo's India website runs an android version above lollipop except our Y21L. Moreover there are no Android updates to phones except security patches and users needs choices, you cant just get stuck with just Funtouch OS 2.5 right . Due to unavailability of kernel sources third party developers couldn't build any custom aftermarket ROM's.
We request Vivo to please release complete Kernel sources so we could build great aftermarket firmware or Release an Software Upgrade to a new android version with a newer Funtouch OS. Vivo is currently violating GPL because the Android Kernel which is just a Linux Kernel is licensed under GPL .