If you have a retail SEA Atrix, then yes, we have the same phone. Webtop is included in the sbf, that's why it's huge (it's about 1.5 GB once uncompressed).
hmm..ok..mean that if i flash custom rom from 4.5.2A version of 2.3.4, if wan to go back stock, i only can flash this 4.5.2A sbf to get back to stock rite?