diff --git a/Code/pico_multi_booter/README.md b/Code/pico_multi_booter/README.md
index 9389d41..6da7169 100644
--- a/Code/pico_multi_booter/README.md
+++ b/Code/pico_multi_booter/README.md
@@ -4,7 +4,7 @@ Here is a bootloader for PicoCalc combined slightly modified [PicoMite](https://
 
 - Pico1 
 - No sdcard inserted,load default app to run from flash. 
-- Sdcard inserted, SD boot menu will show up, load third pico app bin to run at FLASH TARGET OFFSET 2048k-188k
+- Sdcard inserted, SD boot menu will show up, load third pico app bin to run at FLASH TARGET OFFSET 2048k-200k
 
 ## How to compile
 ```
@@ -37,7 +37,7 @@ config.h
 ### SD Card Application Build and Deployment
 **Important Note:**   
 ```
-Applications intended for SD card boot "MUST REBUILD" using a custom linker script to accommodate the program's offset(188k) address.
+Applications intended for SD card boot "MUST REBUILD" using a custom linker script to accommodate the program's offset(200k) address.
 
 Applications intended for SD card boot is in **bin** format, not uf2.
  
diff --git a/Code/pico_multi_booter/applink.py b/Code/pico_multi_booter/applink.py
index 7c3dc08..7973604 100644
--- a/Code/pico_multi_booter/applink.py
+++ b/Code/pico_multi_booter/applink.py
@@ -468,8 +468,8 @@ def Built(dir, app):
     print("original last: ", last," ",'{:02X}'.format(last))
     print("orignal size: ","{:>3}k".format(Size(last-strt, 1024)))
     print("orignal used: ","{:>3}k".format(Size(last, 4*1024)))
-    if last < 0x1002F000:
-      last = 0x1002F000
+    if last < 0x10032000:
+      last = 0x10032000
 
   size = "{:>3}k".format(Size(last-strt, 1024))
   used = "{:>3}k".format(Size(last, 4*1024))
diff --git a/Code/pico_multi_booter/linker_scripts/memmap_default.ld.mp.rp2040 b/Code/pico_multi_booter/linker_scripts/memmap_default.ld.mp.rp2040
index 6dcb8c7..f0251d5 100644
--- a/Code/pico_multi_booter/linker_scripts/memmap_default.ld.mp.rp2040
+++ b/Code/pico_multi_booter/linker_scripts/memmap_default.ld.mp.rp2040
@@ -1,7 +1,7 @@
 /*arduino-pico*/
 MEMORY
 {
-    FLASH(rx) : ORIGIN = 0x10000000 + 188k, LENGTH = __FLASH_LENGTH__ - 188k
+    FLASH(rx) : ORIGIN = 0x10000000 + 200k, LENGTH = __FLASH_LENGTH__ - 200k
     RAM(rwx) : ORIGIN =  0x20000000, LENGTH = __RAM_LENGTH__
     SCRATCH_X(rwx) : ORIGIN = 0x20040000, LENGTH = 4k
     SCRATCH_Y(rwx) : ORIGIN = 0x20041000, LENGTH = 4k
diff --git a/Code/pico_multi_booter/linker_scripts/memmap_mp_rp2040.ld b/Code/pico_multi_booter/linker_scripts/memmap_mp_rp2040.ld
index 188c343..1905bf3 100644
--- a/Code/pico_multi_booter/linker_scripts/memmap_mp_rp2040.ld
+++ b/Code/pico_multi_booter/linker_scripts/memmap_mp_rp2040.ld
@@ -24,7 +24,7 @@
 
 MEMORY
 {
-    FLASH(rx) : ORIGIN = 0x10000000 + 188k, LENGTH = 2048k - 188k
+    FLASH(rx) : ORIGIN = 0x10000000 + 200k, LENGTH = 2048k - 200k
     RAM(rwx) : ORIGIN =  0x20000000, LENGTH = 256k
     SCRATCH_X(rwx) : ORIGIN = 0x20040000, LENGTH = 4k
     SCRATCH_Y(rwx) : ORIGIN = 0x20041000, LENGTH = 4k
diff --git a/Code/pico_multi_booter/linker_scripts/rpi-pico.ld b/Code/pico_multi_booter/linker_scripts/rpi-pico.ld
index b9d4e9d..2a2b595 100644
--- a/Code/pico_multi_booter/linker_scripts/rpi-pico.ld
+++ b/Code/pico_multi_booter/linker_scripts/rpi-pico.ld
@@ -4,7 +4,7 @@
 
 MEMORY
 {
-    FLASH(rx)      : ORIGIN = 0x10000000 + 188k, LENGTH = 2048k - 188k
+    FLASH(rx)      : ORIGIN = 0x10000000 + 200k, LENGTH = 2048k - 200k
     RAM(rwx)       : ORIGIN = 0x20000000, LENGTH = 256k
     SCRATCH_X(rwx) : ORIGIN = 0x20040000, LENGTH = 4k
     SCRATCH_Y(rwx) : ORIGIN = 0x20041000, LENGTH = 4k
diff --git a/Code/pico_multi_booter/memmap_default_rp2040.ld b/Code/pico_multi_booter/memmap_default_rp2040.ld
index 53614ad..31efe94 100644
--- a/Code/pico_multi_booter/memmap_default_rp2040.ld
+++ b/Code/pico_multi_booter/memmap_default_rp2040.ld
@@ -1,6 +1,6 @@
 MEMORY
 {
-    FLASH(rx) : ORIGIN = 0x10000000 + 188k, LENGTH = 2048k - 188k
+    FLASH(rx) : ORIGIN = 0x10000000 + 200k, LENGTH = 2048k - 200k
     RAM(rwx) : ORIGIN =  0x20000000, LENGTH = 256k
     SCRATCH_X(rwx) : ORIGIN = 0x20040000, LENGTH = 4k
     SCRATCH_Y(rwx) : ORIGIN = 0x20041000, LENGTH = 4k
diff --git a/Code/pico_multi_booter/memmap_default_rp2350.ld b/Code/pico_multi_booter/memmap_default_rp2350.ld
index ac9a8ce..100b9b6 100644
--- a/Code/pico_multi_booter/memmap_default_rp2350.ld
+++ b/Code/pico_multi_booter/memmap_default_rp2350.ld
@@ -23,7 +23,7 @@
 
 MEMORY
 {
-    FLASH(rx) : ORIGIN = 0x10000000 + 256k, LENGTH = 4096k - 256k
+    FLASH(rx) : ORIGIN = 0x10000000 + 200k, LENGTH = 4096k - 200k
     RAM(rwx) : ORIGIN =  0x20000000, LENGTH = 512k
     SCRATCH_X(rwx) : ORIGIN = 0x20080000, LENGTH = 4k
     SCRATCH_Y(rwx) : ORIGIN = 0x20081000, LENGTH = 4k
diff --git a/Code/pico_multi_booter/picomite/FileIO.c b/Code/pico_multi_booter/picomite/FileIO.c
index 266fc8e..4c4f2bc 100644
--- a/Code/pico_multi_booter/picomite/FileIO.c
+++ b/Code/pico_multi_booter/picomite/FileIO.c
@@ -5490,6 +5490,7 @@ void SaveOptions(void)
     enable_interrupts_pico();
     uSec(10000);
     disable_interrupts_pico();
+    // XXX @cuu erased 4K, but only write sizeof(option) back?
     flash_range_program(FLASH_TARGET_OFFSET, (const uint8_t *)&Option, sizeof(struct option_s));
     enable_interrupts_pico();
 }
diff --git a/Code/pico_multi_booter/picomite/MM_Misc.c b/Code/pico_multi_booter/picomite/MM_Misc.c
index 3739ff5..4f634f2 100644
--- a/Code/pico_multi_booter/picomite/MM_Misc.c
+++ b/Code/pico_multi_booter/picomite/MM_Misc.c
@@ -4659,7 +4659,8 @@ tp = checkstring(cmdline, (unsigned char *)"HEARTBEAT");
         enable_interrupts_pico();
         uSec(10000);
         disable_interrupts_pico();
-        flash_range_program(FLASH_TARGET_OFFSET, (const uint8_t *)&Option, 768);
+        // XXX @cuu not writing sizeof(option)?
+        flash_range_program(FLASH_TARGET_OFFSET, (const uint8_t *)&Option, sizeof(struct option_s));
         enable_interrupts_pico();
         _excep_code = RESET_COMMAND;
         SoftReset();
diff --git a/Code/pico_multi_booter/picomite/configuration.h b/Code/pico_multi_booter/picomite/configuration.h
index 95d2851..0efca7a 100644
--- a/Code/pico_multi_booter/picomite/configuration.h
+++ b/Code/pico_multi_booter/picomite/configuration.h
@@ -162,7 +162,7 @@ extern "C" {
     #ifdef rp2350
         #define HEAP_MEMORY_SIZE (288*1024) 
         #define MAXVARS             768                     // 8 + MAXVARLEN + MAXDIM * 4  (ie, 64 bytes) - these do not incl array members
-        #define FLASH_TARGET_OFFSET (968 * 1024) 
+        #define FLASH_TARGET_OFFSET (1080 * 1024)           // 200k + 880k -- make sure PicoMite binary is under 880k! (currently ~780k, leave 100k for expansion)
         #define MAX_CPU     (rp2350a ? 396000 : 378000)
         #define MAXSUBFUN           512                     // each entry takes up 4 bytes
         #ifdef USBKEYBOARD
@@ -175,7 +175,7 @@ extern "C" {
     #else
         #define HEAP_MEMORY_SIZE (128*1024) 
         #define MAXVARS             512                     // 8 + MAXVARLEN + MAXDIM * 2  (ie, 56 bytes) - these do not incl array members
-        #define FLASH_TARGET_OFFSET (968 * 1024) 
+        #define FLASH_TARGET_OFFSET (1080 * 1024)           // 200k + 880k -- make sure PicoMite binary is under 880k! (currently ~780k, leave 100k for expansion)
         #define MAX_CPU     420000
         #define MAXSUBFUN           256                     // each entry takes up 4 bytes
         #ifdef USBKEYBOARD
diff --git a/Code/pico_multi_booter/picomite/memmap_default_rp2040.ld b/Code/pico_multi_booter/picomite/memmap_default_rp2040.ld
index 53614ad..31efe94 100644
--- a/Code/pico_multi_booter/picomite/memmap_default_rp2040.ld
+++ b/Code/pico_multi_booter/picomite/memmap_default_rp2040.ld
@@ -1,6 +1,6 @@
 MEMORY
 {
-    FLASH(rx) : ORIGIN = 0x10000000 + 188k, LENGTH = 2048k - 188k
+    FLASH(rx) : ORIGIN = 0x10000000 + 200k, LENGTH = 2048k - 200k
     RAM(rwx) : ORIGIN =  0x20000000, LENGTH = 256k
     SCRATCH_X(rwx) : ORIGIN = 0x20040000, LENGTH = 4k
     SCRATCH_Y(rwx) : ORIGIN = 0x20041000, LENGTH = 4k
diff --git a/Code/pico_multi_booter/picomite/memmap_default_rp2350.ld b/Code/pico_multi_booter/picomite/memmap_default_rp2350.ld
index ac9a8ce..100b9b6 100644
--- a/Code/pico_multi_booter/picomite/memmap_default_rp2350.ld
+++ b/Code/pico_multi_booter/picomite/memmap_default_rp2350.ld
@@ -23,7 +23,7 @@
 
 MEMORY
 {
-    FLASH(rx) : ORIGIN = 0x10000000 + 256k, LENGTH = 4096k - 256k
+    FLASH(rx) : ORIGIN = 0x10000000 + 200k, LENGTH = 4096k - 200k
     RAM(rwx) : ORIGIN =  0x20000000, LENGTH = 512k
     SCRATCH_X(rwx) : ORIGIN = 0x20080000, LENGTH = 4k
     SCRATCH_Y(rwx) : ORIGIN = 0x20081000, LENGTH = 4k
diff --git a/Code/pico_multi_booter/sd_boot/config.h b/Code/pico_multi_booter/sd_boot/config.h
index bbe907b..c7ddd23 100644
--- a/Code/pico_multi_booter/sd_boot/config.h
+++ b/Code/pico_multi_booter/sd_boot/config.h
@@ -36,7 +36,7 @@
 // According to the applink.map ,with combined PicoMite, here is 920k
 // This offset is used to ensure that the bootloader does not get overwritten
 // when loading a new application from the SD card
-#define SD_BOOT_FLASH_OFFSET         (188 * 1024)
+#define SD_BOOT_FLASH_OFFSET         (200 * 1024)
 
 // Maximum size of the application that can be loaded
 // This ensures we don't overwrite the bootloader itself
diff --git a/Code/pico_multi_booter/sd_boot/main.c b/Code/pico_multi_booter/sd_boot/main.c
index ae0b9d7..20f0d5c 100644
--- a/Code/pico_multi_booter/sd_boot/main.c
+++ b/Code/pico_multi_booter/sd_boot/main.c
@@ -285,7 +285,7 @@ void final_selection_callback(const char *path)
     if(path == NULL) {
         //load default app from flash
 
-        snprintf(status_message, sizeof(status_message), "SEL: %s", "FLASH+188k");
+        snprintf(status_message, sizeof(status_message), "SEL: %s", "FLASH+200k");
         text_directory_ui_set_status(status_message);
         sleep_ms(200);
         load_firmware_by_path(path);