Strange Problem with AirportItlwm.kext

If i use latest stable version 1.3 AirportItlwm.kext for Big Sur, download speed is okay but problem with upload speed, upload speed reduced drastically.

If i use previously downloaded version of AirportItlwm.kext, upload and download speed are okay.

I have checked info.plist of both kext, only difference found is BuildMachineOSBuild=19H524 (for working kext) and BuildMachineOSBuild=19H2 (for upload speed issue)

My System details are as under.

Dell vostro 3471, CPU Intel Core I3-9100, GPU Intel UHD Graphics 630, 8GB Ram, 128 GB SATA, 500 GB HDD, Wifi+BT Intel 8265, Audio Realtek ALC891, Ethernet Realtek PCIe Gbe family controller

Open Core 0.7.2 with all the latest updated kext + Big Sur 11.5.1

What can be the cause of this problem and how to resolve this issue ?

submitted by /u/dipakvz
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