diff --git a/docs/limitations.md b/docs/limitations.md
index 191f2ee4..7ecdf33c 100644
--- a/docs/limitations.md
+++ b/docs/limitations.md
@@ -141,7 +141,7 @@ We will summarize transaction outputs as "change" back into same wallet, however
 # Trick Pins
 
 - "deltamode" PIN must be same length as true pin, and differ only in final 4 positions.
-- there are 14 trick "slots", but we avoid slot 10, so 13 available.
+- there are 14 trick "slots", but on mk4, we avoid slot 10, so 13 available. (Q: 14)
 - duress wallets consume 2 slots (or 3 slots for legacy duress wallet) which must be contiguous
 - when restoring trick pins from backup files, "forgotten" pins are not restored,
   and any trick pin which matches the true PIN of the restored system will be dropped
diff --git a/shared/trick_pins.py b/shared/trick_pins.py
index 3f5566e9..7fc8d64d 100644
--- a/shared/trick_pins.py
+++ b/shared/trick_pins.py
@@ -7,7 +7,7 @@
 # - replaces old "duress wallet" and "brickme" features 
 # - changes require knowledge of real PIN code (it is checked)
 # 
-import uctypes, errno, ngu, sys, stash, bip39
+import uctypes, errno, ngu, sys, stash, bip39, version
 from menu import MenuSystem, MenuItem
 from ux import ux_show_story, ux_confirm, ux_dramatic_pause, ux_enter_number, the_ux, ux_aborted
 from stash import SecretStash
@@ -163,8 +163,9 @@ class TrickPinMgmt:
 
         blk = slot.blank_slots
 
-        # bug workaround: don't use slot 10, in bootrom 3.1.4 and earlier
-        blk &= ~(1<<10)
+        if not version.has_qwerty:
+            # bug workaround: don't use slot 10, in Mk4 bootrom 3.1.4 and earlier
+            blk &= ~(1<<10)
 
         return [i for i in range(NUM_TRICKS) if (1<<i & blk)]