FirmTek released new Leopard-compatible firmware for its SeriTek 1S2, 1SM2, 1V4, 1VE4, 1V2E2 and 1SE2 cards:
When to Upgrade Firmware The following firmware updates are mainly for Mac OS X 10.5 "Leopard" users. However, this firmware is also compatible with Mac OS X 10.4. If your existing FirmTek driver is working well with your current version of Mac OS we highly recommend not upgrading. This falls under the heading, "If it's not broken don't fix it". While FirmTek tries to make every new driver release better than the last, there is always a chance that a new firmware upgrade may actually cause an issue with some configurations. The new 5.3.1 firmware version posted below corrects a Leopard wake on sleep issue.
For additional information, please visit the following webpage: http://www.firmtek.com/download/
[translation by Linathael]