hey to all users,
i found this link which sells the back cover for anybody who needs it.
www.aliexpress.com/item/For-Finow-X5-X5-PLUS-LEM5-Smart-Watch-BACK-cover/32796873169.html?spm=2114.01010208.3.10.cGlur3&ws_ab_test=searchweb0_0,searchweb201602_3_10152_10065_10151_10068_10136_10137_10060_10155_10062_437_10154_10056_10055_10054_10059_303_100031_10099_10103_10102_10096_10052_10053_10142_10107_10050_10051_9983_5030018_10172_10084_10083_10119_10080_10082_10081_10110_519_10111_10112_10113_10114_10182_10078_10079_10073_10123_10120_10189_142-9983_10120,searchweb201603_2,ppcSwitch_2&btsid=564725bb-92f7-405c-b8c4-1f8307a6ac14&algo_expid=2319ea1a-f320-43ac-8075-04f6e48f7dea-0&algo_pvid=2319ea1a-f320-43ac-8075-04f6e48f7dea