with WP77 +FW R13 + IOT card “Talon-mangOH-Mirage-WiFi-BT-Module” , I can start the WIFI:
swi-mdm9x28-wp login: [ 38.921364] [RMNET:HI] rmnet_config_notify_cb(): Kernel is trying to unregister wlan0
[ 38.952439] [RMNET:HI] rmnet_config_notify_cb(): Kernel is trying to unregister wlan0
root
root@swi-mdm9x28-wp:~# wifi client start
successfully called start.
root@swi-mdm9x28-wp:~# wifi client scan
starting scan.
Found: SSID: "YF" BSSID: "b0:4e:26:80:d1:2f" Strength:-69 Ref:0x1c9
Found: SSID: "Arwin20A" BSSID: "14:59:c0:2a:b7:e1" Strength:-77 Ref:0x3c9
Found: SSID: "Arwin_Guest" BSSID: "14:59:c0:2a:b7:e3" Strength:-74 Ref:0x5c9
Found: SSID: "" BSSID: "b8:3a:5a:cc:e6:c4" Strength:-75 Ref:0x7c9
Found: SSID: "Fish Home" BSSID: "40:16:7e:b7:3c:24" Strength:-82 Ref:0x9c9
Found: SSID: "\x00\x00\x00\x00\x00\x00\x00\x00" BSSID: "d4:5d:64:0e:46:b8" Strength:-74 Ref:0xbc9
Found: SSID: "" BSSID: "ca:41:1e:2d:4a:13" Strength:-74 Ref:0xdc9
Found: SSID: "FCTD" BSSID: "04:d4:c4:b5:1b:58" Strength:-62 Ref:0xfc9
Found: SSID: "SWI-GUEST" BSSID: "b8:3a:5a:cc:f3:20" Strength:-67 Ref:0x11c9
Found: SSID: "" BSSID: "b8:3a:5a:cc:f3:21" Strength:-65 Ref:0x13c9
Found: SSID: "SWI-WLAN" BSSID: "b8:3a:5a:cc:f3:22" Strength:-64 Ref:0x15c9
Found: SSID: "SWI-MOBILE" BSSID: "b8:3a:5a:cc:f3:23" Strength:-67 Ref:0x17c9
Found: SSID: "" BSSID: "b8:3a:5a:cc:f3:24" Strength:-68 Ref:0x19c9
Found: SSID: "" BSSID: "b8:3a:5a:cc:f3:25" Strength:-67 Ref:0x1bc9
Found: SSID: "Terry" BSSID: "a2:c9:a0:ae:3d:d9" Strength:-45 Ref:0x1dc9
Found: SSID: "HP-Print-15-LaserJet 400 MFP" BSSID: "70:77:81:a9:a5:15" Strength:-74 Ref:0x1fc9
Found: SSID: "TechHill_ASUS_2_4G" BSSID: "4c:ed:fb:a9:aa:68" Strength:-72 Ref:0x21c9
Found: SSID: "nibelungen2" BSSID: "90:9a:4a:43:47:41" Strength:-85 Ref:0x23c9
Found: SSID: "SWI-GUEST" BSSID: "b8:3a:5a:cd:53:e0" Strength:-69 Ref:0x25c9
Found: SSID: "" BSSID: "b8:3a:5a:cd:53:e1" Strength:-69 Ref:0x27c9
Found: SSID: "SWI-WLAN" BSSID: "b8:3a:5a:cd:53:e2" Strength:-69 Ref:0x29c9
Found: SSID: "SWI-MOBILE" BSSID: "b8:3a:5a:cd:53:e3" Strength:-69 Ref:0x2bc9
Found: SSID: "" BSSID: "b8:3a:5a:cd:53:e5" Strength:-69 Ref:0x2dc9
root@swi-mdm9x28-wp:~# legato version
19.11.2_625c7d1acfd1ca45b2dbe189b4cb1ce7
root@swi-mdm9x28-wp:~# cm info
Device: WP7702
IMEI: 352653090002791
IMEISV: 5
FSN: VU735370340201
Firmware Version: SWI9X06Y_02.35.02.00 5208b3 jenkins 2020/06/10 00:30:12
Bootloader Version: SWI9X06Y_02.35.02.00 5208b3 jenkins 2020/06/10 00:30:12
MCU Version: 002.014
PRI Part Number (PN): 9907365
PRI Revision: 001.001
Carrier PRI Name: GENERIC
Carrier PRI Revision: 001.064_001
SKU: 1103530
Last Reset Cause: Reset, User Requested
Resets Count: Expected: 356 Unexpected: 28
You can go back to mangoh board first as it should be working fine.