diff --git a/README.md b/README.md
index 5ffe8b4..0ee4019 100644
--- a/README.md
+++ b/README.md
@@ -117,18 +117,16 @@ $ pip install --user .
 
 #### IDRIS [Jean Zay](http://www.idris.fr/eng/jean-zay/cpu/jean-zay-cpu-hw-eng.html) HPE SGI 8600 supercomputer
 
-As of April. 2024, the following works:
+As of September. 2024, the following works:
 
 You need to load modules in that order exactly.
 ```bash
 # Load NVHPC 23.9 because it has cuda 12.2
 module load nvidia-compilers/23.9 cuda/12.2.0 cudnn/8.9.7.29-cuda  openmpi/4.1.5-cuda nccl/2.18.5-1-cuda cmake
-# Installing mpi4py
-CFLAGS=-noswitcherror pip install mpi4py
 # Installing jax
-pip install --upgrade "jax[cuda12_pip]" -f https://storage.googleapis.com/jax-releases/jax_cuda_releases.html
+pip install --upgrade "jax[cuda12]"
 # Installing jaxdecomp
-export CMAKE_PREFIX_PATH=$NVHPC_ROOT/cmake
+export CMAKE_PREFIX_PATH=$NVHPC_ROOT/cmake # Not always needed
 pip install .
 ```
 
@@ -141,7 +139,7 @@ export CRAY_ACCEL_TARGET=nvidia80
 # Installing mpi4py
 MPICC="cc -target-accel=nvidia80 -shared" CC=nvc CFLAGS="-noswitcherror" pip install --force --no-cache-dir --no-binary=mpi4py mpi4py
 # Installing jax
-pip install --upgrade "jax[cuda11_pip]" -f https://storage.googleapis.com/jax-releases/jax_cuda_releases.html
+pip install --upgrade "jax[cuda12]"
 # Installing jaxdecomp
 export CMAKE_PREFIX_PATH=/opt/nvidia/hpc_sdk/Linux_x86_64/22.5/cmake
 pip install .
diff --git a/tests/test_fft.py b/tests/test_fft.py
index d392f53..c53ee32 100644
--- a/tests/test_fft.py
+++ b/tests/test_fft.py
@@ -46,6 +46,14 @@ def create_spmd_array(global_shape, pdims):
   return global_array, mesh
 
 
+def print_array(array):
+  print(f"shape {array.shape} rank {rank}")
+  for z in range(array.shape[0]):
+    for y in range(array.shape[1]):
+      for x in range(array.shape[2]):
+        print(f"[{z},{y},{x}] {array[z,y,x]}")
+
+
 pencil_1 = (size // 2, size // (size // 2))  # 2x2 for V100 and 4x2 for A100
 pencil_2 = (size // (size // 2), size // 2)  # 2x2 for V100 and 2x4 for A100
 
@@ -122,6 +130,18 @@ def test_fft(pdims, global_shape, local_transpose):
   # Temporary solution because I need to find a way to retrigger the jit compile if the config changes
   jax.clear_caches()
 
+  # Check the forward FFT
+  if penciltype == SLAB_YZ:
+    transpose_back = [2, 0, 1]
+  else:
+    transpose_back = [1, 2, 0]
+  jax_karray_transposed = jax_karray.transpose(transpose_back)
+  assert_allclose(gathered_ - 7, atol=1e-7)
+  assert_allclose(
+      gathered_karray.imag, jax_karray_transposed.imag, rtol=1e-7, atol=1e-7)
+
+  print(f"FFT with transpose check OK!")
+
 
 # Cartesian product tests
 @pytest.mark.parametrize(