[USR-TC] Hiper DSP T1 / E1 cards ?

Hi, I got a good deal on some refurbished Hiper DSP cards. The issue is - the guy says they work on T1. Unfortunately E1 is my only choice. What gives me some hope is that on the back of the chassis one can see the sign "Hiper DSP T1/E1 NIC". Also, some voice gateways (like Quintum) can switch the port from T1 to E1 (and vice versa) only by changing a simple settings inside them. So, my main question is - can I upload an E1 firmware (R2 CAS) into the Hiper DSP card with the idea to switch it from T1 to E1 ?