Want 2 upgrade my Ram

edited September 30 in Others
Model: ZE551ML
RAM: 2G
Firmware/APP Version: WW_2.20.40.198_20160930
Frequency of Occurrence: 1.8ghz
Rooted: No
APP Name:
Screenshot: https://us.v-cdn.net/6031231/uploads/ww_attachments/201912/18/200506n07cl7npp0pwzrpc.jpg

How can i upgrade my firmware

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