In order to update the firmware of the Mobi, you have to go about it a bit differently than is posted on the eInstruction website. They will tell you this process if you call their Tech Support number. eInstruction is a very good company. There are two hex files they will email you with instructions that are similar to the steps I have listed here. This is a more detailed list of the steps needed to complete the manual update of the Mobi receiver and the Mobi tablet itself. The steps are not long or complicated but they should be done in order to have a good connection between the Mobi and the receiver.
Ok, here you go. Proceed as follows:
1.) Open the eInstruction Device Manager.
2.) Plug in the Mobi RF receiver.
3.) Right click on the Mobi icon in the Device Manager and choose properties.
4.) Press the shift and control keys at the same time.
5.) Click on the update Mobi tab that appears.
6.) Click browse and open the hex file that ends with D.
7.) Update the firmware.
8.) The Mobi will restart automatically.
9.) Remove the RF receiver and connect the Mobi to the computer using the USB cord.
10.) Now repeat steps 3-8, except browse and open the hex file that ends in F.
You will need to call eInstruction Technical Support 888-333-4988 to ask for the 2 hex files. They will email them to you.