error 1035 means that the version ios installed is newer than that you are trying to install, so you can't use TBR. However, if you just downgraded your 4.3 -> 4.1, you must already have patched ios, so there should be no point in TBR. If your stuck, follow a current guide, TBR is no longer used and has been replaced with ABHPROT and cboot2 methods. You can follow the sicky guides above this forum, or the one below.