Want 2 upgrade my Ram
Model: ZE551MLRAM: 2GFirmware/APP Version: WW_2.20.40.198_20160930Frequency of Occurrence: 1.8ghzRooted: NoAPP Name: Screenshot: https://us.v-cdn.net/6031231/uploads/ww_attachments/201912/18/200506n07cl7npp0pwzrpc.jpgHow can i upgrade my firmware