You CAN remove it, but it isn't simple, by any means.
You first need to set up a working PS2Dev environment on your PC. Then, you need to find the FMCB 1.7 (the latest available, sorry) source code. Then you need to edit, to your liking, the "splash" picture found in the FMCB source code using your favorite paint program. Then build it using your PS2DEV environment. Done.
This should only be done as a personal preference type thing tho, and not for profit.
Nintendo Entertainment System - Region Free
1.1 Xbox - TSOP - 160GB - LG 8164 - HD/LAN/DVD led
1.0 Xbox - Slim - Xecuter 2.3b lite - 160GB - HD led
V7 PS2/FMCB1.7/2 Datel 16mb cards/Network Adapter