[Question] how can i update this type of phone?

[anepshoecousa]

Hye guys i have this oppo china clone,

i would like to know if this phone possible to be upgrade to lollipop?

Since it make this advertisement notification so much and slow in performance.

[Bacon_Puffs]

This phone is slow due to 512MB RAM and MT6572, not due to KitKat. Time for an upgrade. There are 1GB RAM 64-bit phones for $100 or less these days.

[anepshoecousa]

This phone is slow due to 512MB RAM and MT6572, not due to KitKat. Time for an upgrade. There are 1GB RAM 64-bit phones for $100 or less these days.

yeah i know there is another great phone, and im curently using zenfone 5,
but i want know if this phone possible to put a custom rom in it other than this stock rom which got many bloatware....