Latest Opera Mobile 51 user agents:

User Agent Platform Device
Mozilla/5.0 Linux; Android 6.0; RS81D Build/MRA58K AppleWebKit/537.36 KHTML, like Gecko Chrome/72.0.3626.121 Mobile Safari/537.36 OPR/51.3.2461.138727 Android 6 RS81D
Mozilla/5.0 Linux; Android 6.0; BQ-5515 Build/MRA58K AppleWebKit/537.36 KHTML, like Gecko Chrome/72.0.3626.121 Mobile Safari/537.36 OPR/51.3.2461.138727 Android 6 Wide
Mozilla/5.0 (Linux; U; Android 9; WP5 Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/86.0.4240.110 Mobile Safari/537.36 OPR/51.0.2254.150807 Android 9 WP5
Mozilla/5.0 (Linux; U; Android 9; vivo 2007 Build/PKQ1.190616.001; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/85.0.4183.127 Mobile Safari/537.36 OPR/51.0.2254.150807 Android 9 Y12i
Mozilla/5.0 (Linux; U; Android 9; TECNO KB3 Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/85.0.4183.127 Mobile Safari/537.36 OPR/51.0.2254.150807 Android 9 Camon iSky 3
Mozilla/5.0 (Linux; U; Android 9; TECNO CC9 Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/85.0.4183.81 Mobile Safari/537.36 OPR/51.0.2254.150807 Android 9 Camon 12 Pro
Mozilla/5.0 (Linux; U; Android 9; TECNO CC9 Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/79.0.3945.116 Mobile Safari/537.36 OPR/51.0.2254.150807 Android 9 Camon 12 Pro
Mozilla/5.0 (Linux; U; Android 9; TECNO AB7 Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/84.0.4147.125 Mobile Safari/537.36 OPR/51.0.2254.150807 Android 9 Phantom 9
Mozilla/5.0 (Linux; U; Android 9; MRD-AL00 Build/HUAWEIMRD-AL00; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/79.0.3945.116 Mobile Safari/537.36 OPR/51.0.2254.150807 Android 9 Enjoy 9e
Mozilla/5.0 (Linux; U; Android 9; LUNA G50 Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/86.0.4240.110 Mobile Safari/537.36 OPR/51.0.2254.150807 Android 9 G50
Mozilla/5.0 (Linux; U; Android 9; itel W6501 Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/79.0.3945.116 Mobile Safari/537.36 OPR/51.0.2254.150807 Android 9 P36
Mozilla/5.0 (Linux; U; Android 9; itel W6002E Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/85.0.4183.81 Mobile Safari/537.36 OPR/51.0.2254.150807 Android 9 S15
Mozilla/5.0 (Linux; U; Android 9; itel W6002E Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/77.0.3865.92 Mobile Safari/537.36 OPR/51.0.2254.150807 Android 9 S15
Mozilla/5.0 (Linux; U; Android 9; itel W5005 Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/79.0.3945.116 Mobile Safari/537.36 OPR/51.0.2254.150807 Android 9 P15
Mozilla/5.0 (Linux; U; Android 9; itel L5002 Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/78.0.3904.96 Mobile Safari/537.36 OPR/51.0.2254.150807 Android 9 A25
Mozilla/5.0 (Linux; U; Android 9; Infinix X652B Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/84.0.4147.105 Mobile Safari/537.36 OPR/51.0.2254.150807 Android 9 S5 Lite
Mozilla/5.0 (Linux; U; Android 9; Infinix X652 Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/85.0.4183.127 Mobile Safari/537.36 OPR/51.0.2254.150611 Android 9 S5
Mozilla/5.0 (Linux; U; Android 9; Infinix X610B Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/74.0.3729.136 Mobile Safari/537.36 OPR/51.0.2254.150807 Android 9 Note 6
Mozilla/5.0 (Linux; U; Android 9; HTC 2Q741 Build/PPR1.180610.011; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/71.0.3578.99 Mobile Safari/537.36 OPR/51.0.2254.150807 Android 9 2Q741
Mozilla/5.0 (Linux; U; Android 9; GLK-LX1U Build/HUAWEIGLK-LX1U; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/70.0.3538.64 Mobile Safari/537.36 OPR/51.0.2254.150807 Android 9 Nova 5i