Update Not Detected

[BenTown]

Radio does not detect firmware update on USB but all the contents of the drive are viewable in the file manager.
How can I get it to detect the update?

Android Version
8.0.0
Build Number
px5-userdebug 8.0.0 OPR5/170623.007 end.bsp.20180711.181621 test-keys
System Info
APP 1024x600 2018-07-27 22:18:40
CPU Info
CPU: ARM Cortex-A53 eight-core 4+32 GB PX5, GPU PowerVR G6110
MCU Version
2018-01-23 10:59:33 JY_(R68)_26_C26_6026_CAN(All)
DVD Version
2018-03-26 16:08:56 R-86C-096I-NC-NP-1.0-PI2S
BT Version
BLINK_8723DS_RELEASE/2018:04:12:16:38:52