R conditional loop, multiple lists

I need help stepping through a second loop in R when a test fails in my first loop. Here's the logic:

1. to start use config_list[1] from list
2. then download file path_list[1] from list
3. check if file passes test,
4. if so, download path_list[1 + 1] file from list and go back to step 3
5. if not, change config to next in list and go back to step 2 for failed file

Here's how far I've gotten:

path_list <- list("path1", "path2", "path3")
config_list <- list("a", "b", "c")


for (con in config_list) {
  con[1] # set initial config
  for (val in path_list) {
    print(paste(val, "downloaded")) # download file
    if (val == "path2"){ # check if file passes some test
      con[1 + 1] # if above test fails change to con[1 + 1]
      print(paste(val, "downloaded")) # download file again with new config ???
    }
    print(val)
  }
}