Applications and data before coming down from the high version will be deleted. It is recommended to make backup measures for necessary information before operation.

/iknow-pic . cdn . BCE Bos . com/d 50735 FAE 6 CD 7 b 8907 a 83 1ee 022442 a 7d 8330 e 92 " target = " _ blank " title = " " class = " ikqb _ img _ alink " >； /iknow-pic . cdn . BCE Bos . com/d 50735 FAE 6 CD 7 b 8907 a 83 1ee 022442 a 7d 8330 e 92？ x-BCE-process = image % 2f resize % 2cm _ lfit % 2cw _ 600% 2ch _ 800% 2c limit _ 1% 2f quality % 2cq _ 85% 2f format % 2cf _ auto " esrc = "/ht 204 138。 About the backup of iOS devices