Bank34 can be configured as 2.5V by using LDO configuration, but there is an limitation for Bank35.
If On-SOM Bluetooth support is required, then BANK35 IO voltage must be set to 3.3V only and so BANK35 doesn’t support 2.5V LVDS IOs at this time.
For further inquiries, please get in touch with mktg@iwave-global.com
Please find the detailed G28M product information in the below link,