Finally I found how we load AVM1 swf as AVM2.

• Movie should be uncompressed
• Movie should not include any as2 script

All we need to do is…

• Load AVM1 movie as bytecode with URLLoader
• Change index[3] ( that is 6,7 or 8 ) to 9
• Find the byte code pattern, “44, 11, 00″, that is somewhere around position 10 to 30
• Rewtire that to “44, 11, 08“
• Load bytecode with Loader

That it. Now you can fully access property and movieclips in the AVM1 movies.