Load options for 8K BASIC 3.0 are the 88-SIO (Rev 0 or 1) and the 88-ACR (cassette). 
No other options are supported.

8K BASIC 3.0 supports only the 88-SIO (Rev 0 or 1) as the console.

Instructions for loading BASIC 3.0 are in "Appendix A" of the Altair BASIC 1975 manual
(page 46). Do NOT refer to "Appendix A Supplement" which documents version 3.2.