Latest Four Mobile S61 Eco 2 user agents:

User Agent	Browser	Platform
Mozilla/5.0 (Linux; Android 6.0; Four_S61) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.99 Mobile Safari/537.36	Chrome Mobile 80	Android 6
Mozilla/5.0 (Linux; Android 6.0; Four_S61 Build/MRA58K; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/84.0.4147.111 Mobile Safari/537.36	Chrome Webview 84	Android 6
Mozilla/5.0 (Linux; Android 6.0; Four_S61 Build/MRA58K; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/79.0.3945.116 Mobile Safari/537.36	Chrome Webview 79	Android 6
Mozilla/5.0 (Linux; Android 6.0; Four_S61 Build/MRA58K; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/60.0.3112.50 Mobile Safari/537.36	Chrome Webview 60	Android 6
Mozilla/5.0 (Linux; Android 6.0; Four_S61 Build/MRA58K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.101 Mobile Safari/537.36 EdgA/91.0.864.48	Microsoft Edge 91	Android 6
Mozilla/5.0 (Linux; Android 6.0; Four_S61 Build/MRA58K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.101 Mobile Safari/537.36	Chrome Mobile 91	Android 6
Mozilla/5.0 (Linux; Android 6.0; Four_S61 Build/MRA58K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/89.0.4389.128 Mobile Safari/537.36 OPR/75.0.3969.259	Opera Mobile 75	Android 6
Mozilla/5.0 (Linux; Android 6.0; Four_S61 Build/MRA58K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/77.0.3865.90 Mobile Safari/537.36	Chrome Mobile 77	Android 6
Mozilla/5.0 (Linux; Android 11.0; Four_S61 Build/MRA58K; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/105.0.5195.79 Mobile Safari/537.36	Chrome Webview 105	Android 11
Mozilla/5.0 (Linux; Android 6.0; Four_S61 Build/MRA58K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/134.0.6998.178 Mobile Safari/537.36	Chrome Mobile 134	Android 6
Mozilla/5.0 (Linux; Android 6.0; Four_S61 Build/MRA58K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/128.0.6613.186 Mobile Safari/537.36 OPR/114.0.5282.102	Opera Mobile 114	Android 6