old_contents: import gc
  gc.threshold((gc.mem_free() + gc.mem_alloc()) // 4)
  import uos
  from flashbdev import bdev
  
  try:
      if bdev:
          uos.mount(bdev, '/')
  except OSError:
      import inisetup
      inisetup.setup()
  
  gc.collect()
  
new_contents: import gc
  gc.threshold((gc.mem_free() + gc.mem_alloc()) // 4)
  import uos
  from flashbdev import bdev
  
  if bdev:
      try:
          uos.mount(bdev, '/')
      except:
          import inisetup
          inisetup.setup()
  
  gc.collect()
  
subject: Fix AttributeError in _boot.py if flash not formatted.