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-siapkan memory minimal 4gb
-download file www.vivo.com/id/support/upgra...
-setelah download pindah file ke memory micro sd
-pindah file vivo y91 ke memory sd card
-jangan pindah file didalam folder supaya file lebih mudah terbaca di hp
-lanjut ikuti proses step by step seperti divideo
-terimakasih sekian