Latest Vivo X21S user agents:

User Agent	Browser	Platform
Mozilla/5.0 (Linux; U; Android 9; zh-cn; V1814T Build/PKQ1.180819.001) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/68.0.3440.91 MQQBrowser/13.7 Mobile Safari/537.36	QQ Browser 13	Android 9
Mozilla/5.0 (Linux; U; Android 9; zh-CN; V1814T Build/PKQ1.180819.001) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/123.0.6312.80 UCBrowser/17.5.0.1381 Mobile Safari/537.36	UC Browser 17	Android 9
Mozilla/5.0 (Linux; U; Android 9; zh-cn; V1814A Build/PKQ1.180819.001) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/66.0.3359.126 MQQBrowser/10.2 Mobile Safari/537.36	QQ Browser 10	Android 9
Mozilla/5.0 (Linux; U; Android 9; zh-cn; V1814A Build/PKQ1.180819.001) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/109.0.5414.86 MQQBrowser/15.3 Mobile Safari/537.36 COVC/047125	QQ Browser 15	Android 9
Mozilla/5.0 (Linux; U; Android 9; zh-cn; V1814A Build/PKQ1.180819.001) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/109.0.5414.86 MQQBrowser/13.8 Mobile Safari/537.36 COVC/047113	QQ Browser 13	Android 9
Mozilla/5.0 (Linux; U; Android 8.1; vivo X21s Build/OPM6.171019.030.K1) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/67.0.3396.97 Mobile Safari/537.36	Chrome Webview 67	Android 8
Mozilla/5.0 (Linux; U; Android 8.1; vivo X21s Build/OPM6.171019.030.H1) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/60.0.3112.116 UCBrowser/12.1.4.994 Mobile Safari/537.36	UC Browser 12	Android 8
Mozilla/5.0 (Linux; U; Android 8.1; vivo X21s Build/OPM6.171019.030.H1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/59.0.2785.49 Mobile Safari/537.36	Chrome Mobile 59	Android 8
Mozilla/5.0 (Linux; U; Android 8.1; vivo X21s Build/OPM5.171019.015) AppleWebKit/537.36 (KHTML, like Gecko) Mobile Safari/537.36 baidubrowser/7.9.12.0 (Baidu; P1 8.1)	Baidu Browser 7	Android 8
Mozilla/5.0 (Linux; U; Android 8.1; vivo X21s Build/OPM4.171019.021.R1) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/66.0.3359.158 Mobile Safari/537.36	Chrome Webview 66	Android 8
Mozilla/5.0 (Linux; U; Android 8.1; vivo X21s Build/OPM4.171019.021.R1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3112.116 UCBrowser/11.8.0.960 Mobile Safari/537.36	UC Browser 11	Android 8
Mozilla/5.0 (Linux; U; Android 8.1; vivo X21s Build/OPM1.171019.015) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/59.0.2785.49 Mobile Safari/537.36	Chrome Mobile 59	Android 8
Mozilla/5.0 (Linux; U; Android 8.0; vivo X21s Build/OPR2.170623.027) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/66.0.3359.158 Mobile Safari/537.36	Chrome Webview 66	Android 8
Mozilla/5.0 (Linux; U; Android 8.0; vivo X21s Build/OPR1.170623.027) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/62.0.3202.84 Mobile Safari/537.36 baidubrowser/7.18.21.0 (Baidu; P1 8.0)	Baidu Browser 7	Android 8
Mozilla/5.0 (Linux; U; Android 8.0; vivo X21s Build/OPR1.170623.026) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.91 Mobile Safari/537.36	Chrome Mobile 68	Android 8
Mozilla/5.0 (Linux; U; Android 8.0; vivo X21s Build/OPD1.170816.018) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/68.0.3440.85 Mobile Safari/537.36	Chrome Webview 68	Android 8
Mozilla/5.0 (Linux; U; Android 8.0; vivo X21s Build/OPD1.170816.011) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.85 Mobile Safari/537.36	Chrome Mobile 68	Android 8
Mozilla/5.0 (Linux; U; Android 8.0; vivo X21s Build/OPD1.170816.011) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.109 Mobile Safari/537.36	Chrome Mobile 65	Android 8
Mozilla/5.0 (Linux; U; Android 8.0; vivo X21s Build/OPD1.170816.011) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/59.0.3071.125 MQQBrowser/9.2 Mobile Safari/537.36	QQ Browser 9	Android 8
Mozilla/5.0 (Linux; Android 9; vivo X21S) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/76.0.3809.132 Mobile Safari/537.36	Chrome Mobile 76	Android 9