diff --git a/fusee/fusee-secondary/src/fs_utils.c b/fusee/fusee-secondary/src/fs_utils.c
index 59b2daa48..f3f7042b5 100644
--- a/fusee/fusee-secondary/src/fs_utils.c
+++ b/fusee/fusee-secondary/src/fs_utils.c
@@ -13,3 +13,14 @@ size_t read_from_file(void *dst, size_t dst_size, const char *filename) {
         return sz;
     }
 }
+
+size_t dump_to_file(const void *src, size_t src_size, const char *filename) {
+    FILE *file = fopen(filename, "wb+");
+    if (file == NULL) {
+        return 0;
+    } else {
+        size_t sz = fwrite(src, 1, src_size, file);
+        fclose(file);
+        return sz;
+    }
+}
diff --git a/fusee/fusee-secondary/src/fs_utils.h b/fusee/fusee-secondary/src/fs_utils.h
index 2f71275ff..9574370e1 100644
--- a/fusee/fusee-secondary/src/fs_utils.h
+++ b/fusee/fusee-secondary/src/fs_utils.h
@@ -5,5 +5,6 @@
 #include "sdmmc.h"
 
 size_t read_from_file(void *dst, size_t dst_size, const char *filename);
+size_t dump_to_file(const void *src, size_t src_size, const char *filename);
 
 #endif
diff --git a/fusee/fusee-secondary/src/switch_fs.c b/fusee/fusee-secondary/src/switch_fs.c
index fb0daab2f..c6a2a0d56 100644
--- a/fusee/fusee-secondary/src/switch_fs.c
+++ b/fusee/fusee-secondary/src/switch_fs.c
@@ -44,6 +44,7 @@ static int mmc_partition_initialize(device_partition_t *devpart) {
     if (mmcpart->mmc == &g_sd_mmc && !g_sd_mmc_initialized) {
         int rc = sdmmc_init(mmcpart->mmc, mmcpart->controller);
         if (rc == 0) {
+            sdmmc_set_write_enable(mmcpart->mmc, SDMMC_WRITE_ENABLED);
             g_sd_mmc_initialized = true;
         }
         return rc;