Browserhax won't work below 9.0 anyway, because of the *hax payload, but rxTools runs through the old spider exploit, which supports firmwares 4.0-9.2 and all browser versions inbetween those firmwares (but cannot run HBL)
You can set up rxTools 3.0 through the spider exploit, and use Pasta Mode later on to update your console to 9.0/9.2.