diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index e95be03..5b27069 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -6,7 +6,7 @@ jobs:
   build:
     runs-on: ubuntu-22.04
     env:
-        SDK_VERSION: 3.1.51.0bi
+        SDK_VERSION: 3.1.50.2bi
         SYS_PYTHON: /usr/bin/python3
         PACKAGES: emsdk hpy _ctypes pygame
         BUILD_STATIC: emsdk _ctypes hpy
diff --git a/pygbag/support/cross/aio/fetch.py b/pygbag/support/cross/aio/fetch.py
index 95c519a..8cd4c6c 100644
--- a/pygbag/support/cross/aio/fetch.py
+++ b/pygbag/support/cross/aio/fetch.py
@@ -118,12 +118,12 @@ def make_src_dst(base_url, base_path, path, target):
     return preload_list
 
 
-async def preload(chroot=None, chdir=True, silent=FS_SILENT, debug=FS_DEBUG, standalone=False):
+async def preload(chroot=None, chdir=True, silent=FS_SILENT, debug=FS_DEBUG, isolated=False):
     global preload_list, preloaded
 
     # if not using FS, do not change directory
     if not len(preload_list):
-        if standalone:
+        if isolated:
             return []
         # return all previous filesets
         return preloaded.copy()
@@ -173,12 +173,13 @@ async def preload(chroot=None, chdir=True, silent=FS_SILENT, debug=FS_DEBUG, sta
         if not silent:
             print("FS:174:", filename)
 
-    preloaded.extend(fileset)
+    if not isolated:
+        preloaded.extend(fileset)
 
     if chdir:
         os.chdir(chroot)
 
-    if standalone:
+    if isolated:
         return fileset
 
     await asyncio.sleep(0)
diff --git a/pygbag/support/pygbag_app.py b/pygbag/support/pygbag_app.py
index 87377ed..0209dce 100644
--- a/pygbag/support/pygbag_app.py
+++ b/pygbag/support/pygbag_app.py
@@ -1,4 +1,11 @@
-this = __import__(__name__)
+import sys
+
+if sys.platform not in ('emscripten','wasi') or aio.cross.simulator:
+    sleep_delay = 0
+else:
+    sleep_delay = 0.0155
+
+
 
 from pygbag_ui import Tui, TTY
 import pygbag_ui as ui
@@ -7,41 +14,30 @@
 ux_dim(1280 // 2 , 720 // 2)
 
 
-if 1:
-
-    import pygame
-    class vpad:
-        X = 0
-        Z = 1
-        Y = 2
-        evx = []
-        evy = []
-        evz = []
-        axis = [evx, evz, evy]
+class vpad:
+    X = 0
+    Z = 1
+    Y = 2
+    evx = []
+    evy = []
+    evz = []
+    axis = [evx, evz, evy]
 
-        LZ = 0.5
+    LZ = 0.5
 
-        @classmethod
-        def get_axis(self, n):
-            if len(self.axis[n]):
-                return self.axis[n].pop(0)
-            return 0.0
+    @classmethod
+    def get_axis(self, n):
+        if len(self.axis[n]):
+            return self.axis[n].pop(0)
+        return 0.0
 
-        @classmethod
-        def emit(self, axis, value):
-            self.axis[axis].append(float(value))
-            ev = pygame.event.Event(pygame.JOYAXISMOTION)
-            pygame.event.post(ev)
-            return False
-
-
-
-
-import sys
-if sys.platform not in ('emscripten','wasi') or aio.cross.simulator:
-    sleep_delay = 0
-else:
-    sleep_delay = 0.0155
+    @classmethod
+    def emit(self, axis, value):
+        import pygame
+        self.axis[axis].append(float(value))
+        ev = pygame.event.Event(pygame.JOYAXISMOTION)
+        pygame.event.post(ev)
+        return False
 
 
 
@@ -62,7 +58,7 @@ def console():
     if sys.platform not in ('emscripten','wasi') or aio.cross.simulator:
         LINES = LINES - CONSOLE
 
-    TTY.set_raw(1)
+    ui.TTY.set_raw(1)
     import select,os,platform
 
     platform.shell.is_interactive = False
diff --git a/scripts/build-loader.sh b/scripts/build-loader.sh
index 4669bda..c678ab9 100755
--- a/scripts/build-loader.sh
+++ b/scripts/build-loader.sh
@@ -270,6 +270,21 @@ emcc \\
      -o ${DIST_DIR}/python${PYMAJOR}${PYMINOR}/${MODE}.js build/${MODE}.o \\
      $LDFLAGS -lembind -sERROR_ON_UNDEFINED_SYMBOLS=0
 
+echo "
+
+error: undefined symbol: _emval_decref (referenced by root reference (e.g. compiled C/C++ code))
+error: undefined symbol: _emval_delete (referenced by root reference (e.g. compiled C/C++ code))
+error: undefined symbol: _emval_greater_than (referenced by root reference (e.g. compiled C/C++ code))
+error: undefined symbol: _emval_incref (referenced by root reference (e.g. compiled C/C++ code))
+error: undefined symbol: _emval_less_than (referenced by root reference (e.g. compiled C/C++ code))
+error: undefined symbol: _emval_new_cstring (referenced by root reference (e.g. compiled C/C++ code))
+error: undefined symbol: _emval_set_property (referenced by root reference (e.g. compiled C/C++ code))
+error: undefined symbol: _emval_strictly_equals (referenced by root reference (e.g. compiled C/C++ code))
+
+"
+
+#
+
 
 # --bind -fno-rtti