1. Enabling Resizable BAR on Lenovo T5 desktop:

- Enter the BIOS by pressing F1 or F2 during startup

- Navigate to the "Advanced" section

- Look for options related to "PCIe/PCI Express" or "Graphics"

- Find the "Resizable BAR" option and set it to "Enabled"

- Save and exit the BIOS

Note: not all Lenovo T5 desktops may support Resizable BAR, so check your system specification before attempting to enable it.

2. Accessing the Advanced BIOS on Lenovo T5 desktop:

- Enter the BIOS as mentioned above

- Look for an option to "Switch to Advanced mode" or "Advanced BIOS settings"

- This may vary depending on the BIOS version and manufacturer

- Once in Advanced mode, you will have access to additional settings and options

3. Enabling Resizable BAR on Intel Arc A770:

- Enter the default BIOS by pressing Delete or F2 during startup

- Navigate to the "Advanced" or "Chipset" section

- Look for the "Resizable BAR" option and set it to "Enabled"

- Save and exit the BIOS

Note: not all systems support Resizable BAR, so check your system specification before attempting to enable it.