diff --git a/src/bootloader/bootloader_with_flash.c b/src/bootloader/bootloader_with_flash.c
index 9e733ec..957d1be 100644
--- a/src/bootloader/bootloader_with_flash.c
+++ b/src/bootloader/bootloader_with_flash.c
@@ -32,7 +32,7 @@ typedef struct _sflash_img_hdr_t
 
 enum srec_type
 {
-	srec_err, srec_sob, srec_data, srec_rec, srec_eob
+	srec_err, srec_err_chksum, srec_sob, srec_data, srec_rec, srec_eob
 };
 
 uint8_t h2i(uint8_t *c)
@@ -102,7 +102,7 @@ int decode_srec(srec_t *pRec, uint8_t *pBuf, int buflen)
 	chksum = ~chksum;
 	byte = h2i(&pRec->data[2*i]);
 	if (chksum != byte)
-		return 0;
+		return srec_err_chksum;
 
 	return pRec->type;
 }
@@ -215,7 +215,7 @@ void Exec_RE_at(void *pEntry)
 
 int main(int argc, char *argv[])
 {
-	uint8_t buf[256];
+	uint8_t buf[1024];
 	srec_t srec;
 	int srec_state, i;
 	uint32_t haddr, result;