diff --git a/mercurial/exchange.py b/mercurial/exchange.py
--- a/mercurial/exchange.py
+++ b/mercurial/exchange.py
@@ -315,6 +315,10 @@
                 version = part.params[b'version']
                 if version in (b'01', b'02'):
                     version = b'v2'
+                elif version == b'03' and ui.configbool(
+                    b'experimental', b'changegroup3'
+                ):
+                    version = b'v2'
                 else:
                     raise error.Abort(
                         _(
diff --git a/tests/test-lfs-bundle.t b/tests/test-lfs-bundle.t
--- a/tests/test-lfs-bundle.t
+++ b/tests/test-lfs-bundle.t
@@ -95,3 +95,27 @@
   OK
   ---- Applying src-lfs.bundle to dst-lfs ----
   OK
+
+  $ for i in $SRCNAMES; do
+  >   echo % test bundle type $i
+  >   hg debugbundle $TESTTMP/$i.bundle
+  >   hg debugbundle --config experimental.changegroup3=True \
+  >                  --spec $TESTTMP/$i.bundle
+  >   echo
+  > done
+  % test bundle type src-normal
+  Stream params: {Compression: BZ}
+  changegroup -- {nbchanges: 2, version: 03} (mandatory: True)
+      92a23f1a59ca009ca9631a529d05e020c3873842
+      7ee5ca02c65436e529977365458ef3062cf9f746
+  cache:rev-branch-cache -- {} (mandatory: False)
+  bzip2-v2
+  
+  % test bundle type src-lfs
+  Stream params: {Compression: BZ}
+  changegroup -- {nbchanges: 2, version: 03} (mandatory: True)
+      92a23f1a59ca009ca9631a529d05e020c3873842
+      7ee5ca02c65436e529977365458ef3062cf9f746
+  cache:rev-branch-cache -- {} (mandatory: False)
+  bzip2-v2
+