Hers a cool little trick for these *****y ass manufactures. If you can't find a driver on their US site....try the uk one. Here is the link to your u-max driver.
UMax UK

I looked and saw drivers for Umax Astra 3400 v.3.75

Chad Williams
chad5160@excite.com
'99 SVT Frost Silver #812 of 2760 Born on Jan. 12, 1999