diff --git a/FlashGBX/FlashGBX.py b/FlashGBX/FlashGBX.py
index dd10565..42ca428 100644
--- a/FlashGBX/FlashGBX.py
+++ b/FlashGBX/FlashGBX.py
@@ -11,7 +11,7 @@
 hw_devices = [hw_GBxCartRW]
 
 APPNAME = "FlashGBX"
-VERSION_PEP440 = "1.2"
+VERSION_PEP440 = "1.2.1"
 VERSION = "v{:s}".format(VERSION_PEP440)
 
 class FlashGBX(QtWidgets.QWidget):
diff --git a/FlashGBX/hw_GBxCartRW.py b/FlashGBX/hw_GBxCartRW.py
index 1f94276..46b5e90 100644
--- a/FlashGBX/hw_GBxCartRW.py
+++ b/FlashGBX/hw_GBxCartRW.py
@@ -475,15 +475,13 @@ def set_mode(self, command):
 		buffer = format(command, 's')
 		self.write(buffer)
 		if command in (self.DEVICE_CMD["VOLTAGE_3_3V"], self.DEVICE_CMD["VOLTAGE_5V"]):
-			#time.sleep(0.01)
+			#time.sleep(0.005)
 			pass
 
 	def set_number(self, number, command):
 		buffer = format(command, 's') + format(int(number), 'x') + '\x00'
 		self.write(buffer)
-		if command in (self.DEVICE_CMD["SET_START_ADDRESS"]):
-			#time.sleep(0.005)
-			pass
+		time.sleep(0.005)
 	
 	def EnableRAM(self, mbc=1, enable=True):
 		if enable:
@@ -1181,7 +1179,7 @@ def _TransferData(self, args, signal): # called by thread
 									self.gbx_flash_write_data_bytes(self.DEVICE_CMD["GBA_FLASH_WRITE_BYTE"], data)
 							
 							else: # EEPROM / SRAM
-								self.gbx_flash_write_data_bytes(write_command, data)
+								self.gbx_flash_write_data_bytes(self.DEVICE_CMD[write_command], data)
 						
 						self.SetProgress({"action":"WRITE", "bytes_added":len(data)})
 						self.wait_for_ack()
diff --git a/FlashGBX/res/config.zip b/FlashGBX/res/config.zip
index bb2c0de..33b21c4 100644
Binary files a/FlashGBX/res/config.zip and b/FlashGBX/res/config.zip differ
diff --git a/README.md b/README.md
index 0b9df5e..2df57c9 100644
--- a/README.md
+++ b/README.md
@@ -267,7 +267,8 @@ The author would like to thank the following very kind people for their help and
 - Added a firmware check when writing to cartridges with flash chips manufactured by Sharp (unsupported by GBxCart RW firmware R25)
 - Added optional verification of written data after ROM flashing *(thanks marv17 for the suggestion)*
 
-### v1.2 (released 2021-01-16)
+### v1.2/v1.2.1 (released 2021-01-16)
 - Fixed a bug introduced in v1.1 that broke MBC3 handling *(thanks marv17 for reporting)*
 - Will now default back to 5V for Game Boy cartridges after unsuccessful flash chip auto-detection
 - Added support for DIY carts with the AT49F040 flash chip *(thanks howie0210)*
+- Minor bug fixes
diff --git a/setup.py b/setup.py
index 11b5644..639429f 100644
--- a/setup.py
+++ b/setup.py
@@ -4,7 +4,7 @@
 
 setuptools.setup(
 	name="FlashGBX",
-	version="1.2",
+	version="1.2.1",
 	author="Lesserkuma",
 	description="A GUI application that can read and write Game Boy and Game Boy Advance cartridge data. Currently supports the GBxCart RW hardware device by insideGadgets.",
 	url="https://github.com/lesserkuma/FlashGBX",