If your R4i SDHC has the web address "www.r4i-sdhc.com" on the front and a yellow icon that says 1.4, download firmware 1.11b from their site.
If yours is from that site, but does NOT have the 1.4 mark, or if yours is from the knockoff "www.r4isdhc.com", follow B_Blue's link. The download gives numerous files, but all I had to do was copy the 2 TTMENU files to the root of my SD card. Booted up the R4i, opened TTMENU through my games list, then loaded M&L3, and the AP blocks were gone.